ATEEZ debuted 1 year and 4 months ago. Despite being a rookie group and getting ignored by Korean fans, media, and broadcast, the industry is very aware of them!

1.Eric Nam said ATEEZ stands out and is different from the other groups
"If you're competing against so many groups, you really got to stand out. Be it visually, be it sonically, be it performance-wise, be it personality-wise. It doesn't matter but you have to stick out and this is why I'm saying I think ATEEZ has a very bright future ahead. I'm on Youtube, I run into ATEEZ and I was like, 'Oh! This is different! There is something different about this group. I can't put my finger on it but they are not doing what everybody else is doing. And that is what I think will set ATEEZ apart."

2. B.A.P.'s Daehyun said ATEEZ caught his attention and that they are so cool and reminds him of B.A.P.

3.EXID's LE chose ATEEZ as her favorite rookie group.
"I've watched their performance. They are very talented!"

4.NCT's Taeyong said he really likes ATEEZ's songs

5.SS301's Youngsaeng chose ATEEZ as his favorite rookie group

"I've watched their performance videos even before they debuted. They are very talented." source

6.When Yunho met his role model TVXQ's Yunho on M!Countdown, TVXQ's Yunho said, "I know you very well, Yunho."

7.DreamCatcher's Siyeon named ATEEZ as her favorite boy group. She also said she likes ATEEZ's songs on DC cafe

8.DreamCatcher's SuA said all DC members went to see ATEEZ's concert 

"Their performance is so good and they are so cool. I really like their songs. There are songs that really my style too, Really good."

9.SF9's Inseong praised ATEEZ's performance

10.KARD's Matthew said he saw ATEEZ's videos a lot and every member stands out + praised Mingi's voice

"Say my name, say my name.. I like rappers with low tone. Mingi is his name. I don't know him personally. I've never met them before. I've seen their videos many times and listen to their music a lot. I like his voice a lot, I like him. I like all of them, though. There is no member who doesn't have.. every one of them really stands out. Every one of them have their own charms."

11.ONEUS talking about being ATEEZ fans

Keonhee: After the filming yesterday, I think I just became a fan of ATEEZ.
Hwanwoong: We saw them performing their new song yesterday.
Xion: They're really cool. Awesome.
Hwanwoong: I think you can anticipate ATEEZ's new song.
Ravn: Brother!
Xion: It's really cool.
Hwanwoong: It's really cool, hakuna matata~

12.ONEUS' Keonhee chose the line "Hakuna Matata"(ATEEZ's Wave) which is in as the verse that left a big impression on him

13.ACE's Donghun sang ATEEZ songs during his V Live and said ATEEZ's songs are great

14.Sechskies' Lee Jaejin and Jang Suwon praised ATEEZ's performance
LJJ: "These kids perform so intensely.
JSW: "Their cherographies are so strong. They also sing very good."

15.Rookie group B.O.Y.'s Kookheon and Yuvin said they fell in love with ATEEZ's performance

16.BLOCK B's U-Kwon says ATEEZ is a talented group with visuals

17.Teen Top's Changjo shared ATEEZ's Answer on his Instagram story and said Jongho is so good + congratulated ATEEZ for winning on a music show. He also went to see ATEEZ's Seoul concert  and shared a pic of the venue

18.Park Jimin said she likes and listens to ATEEZ's Hala Hala so much+did a dance cover
"I drive a lot these days and I feel happy when I listen to songs in my car. I listen to ATEEZ’s Hala Hala. When I feel sleepy I listen to this song. I like it so much."

19.A.C.E.'s Byeongkwan called ATEEZ the leading group of Kpop's next generation 

20.JPOP Group EXILE Tribe's Rui Yonamine attended ATEEZ's event in Japan and shared the signed album he received from ATEEZ on his IG story
"I'm very glad to see you guys' performance. This means a lot to me."

21.Rookie group Z-BOYS went to ATEEZ's waiting room to meet them and praised their performance

"We are really excited. We saw your performance. It was really amazing. We can feel the energy.. so powerful!

22.Rookie group TRCNG's Hohyeon said he thinks he's Atiny

23.Rookie group N.CUS' Seungyong said he loves ATEEZ and that Hongjoong is his role model 

24.Predebut group Climix's Taehoon said his favorite group is ATEEZ and that Choi San is his role model

25.Predebut group Climix's Dohyun said ATEEZ's Hongjoong inspires him a lot and that he's his motivation. Also has a Hongjoong photocard in his phone case

26.Predebut group Climix's Minseog said ATEEZ is his favorite group

"I like ATEEZ. They are so cool. I always listen to their music and watch their performance. They are my favorite artists."

27.TRCNG’s Jisung said he went ATEEZ’s concert with friends and that he thought they were really cool

28.Block B's Jaehyo and Kyung went to see ATEEZ concert

29.Predebut group EBOYZ' Wonhyuk said ATEEZ is his role model

30.Woncheol of MY. ST who debuted only a few days ago went to see ATEEZ concert

31.Rookie group Aweek's Jinghyu is a huge Atiny and he looks up to Hongjoong

32.Rookie group TOO's Jaehyun said he's been listening to ATEEZ lately

33. Rookie group NOIR’s Minhyuk and Yunsung went to see ATEEZ concert

Reporter Yoo Jihoon says when ATEEZ performs at the music shows, other idols all gather together to watch ATEEZ on the monitor   source
"What is interesting about them recently is that when ATEEZ performs at music shows, there's a monitor in the middle of the waiting room right? When ATEEZ performs, other idols came out and went to watch their performance. They all gathered together.
It shows how even among other idols, they think highly and looked up to ATEEZ level of stage completion.
I'm not entirely sure how much money they invest, but according to my acq. who was in this line of job, their company's support/development team is doing really well. So if a company were to launch an idol group, they should invest like what KQ Ent did to ATEEZ.
That (such investment) might be the right way to do it and that the money wouldn't go to drain."

Bonus: Here are idols covering and singing to ATEEZ's songs. Being covered by other idols might not be a big deal for senior groups but rookie groups' songs being covered or mentionedby other groups is very rare.

•A cover group did Seoul Music Awards 2020's opening with ATEEZ's Wonderland. What's more interesting about this is that it's the first time a ceremony is opened with a rookie group/song. (ATEEZ wasn't invited)

•CLC's Yujin and Seungyeon singing ATEEZ's Answer on their Instagram live

•Stray Kids singing and dancing to ATEEZ's Wonderland during their live broadcast

•Samuel covered ATEEZ's Say My Name choreography

•Rookie group Newkidd danced to ATEEZ's Answer

•DreamCatcher danced to Hala Hala

•Rookie group Aweek covered ATEEZ's Wonderland 

•Rookie group GWSN's Mina did a dance cover of ATEEZ's Hala Hala and Wonderland

•SEVENTEEN's Seungkwan doing ATEEZ's Say My Name dance

•GRIEND singing and dancing along to ATEEZ's Say My Name 

•GOT7's Yugyeom is dancing to ATEEZ's Illusion

•Rookie group CiCi covered ATEEZ's Hala Hala

•Rookie group BVNDIT singing and dancing to ATEEZ's Wave

•Nature's Lu singing and dancing to ATEEZ's Wonderland

•Winner's Seunghoon taught ATEEZ's Wave choreo during V Live

•Rookie group ENOi danced to ATEEZ's Answer

•DreamNote's Boni covered ATEEZ's Answer

•NeonPunch covered ATEEZ's Say My Name

•Aweek covered ATEEZ's Pirate King

•A.C.E.'s Byeongkwan covered ATEEZ's Answer and said the dance move is very cool

See this Twitter thread for more