I read a Beomgyu post recently where he said the Game Caterers episode was the first time TXT has met most of the other idols.
The same thing with SSE groups
The ones that have known each other before the show are MonstaX & WJSN because they are training together (they even had a internal competition), also them with Jeong Sewoon and K.Will because they had starship planet project (and seems like Sewoon was also a trainee with mosntax and wjsn?)
The one that rarely meets are their newest group, cravity and ive.
They just met occasionally, like doing a tiktok challenge or passing by at the elevator. But lately IVE are getting closer with wjsn, maybe mainly dayoung.
But the Game Caterer itself not just for a marketing or content, but also made IVE closer to MonstaX (and others), as the MonstaX really rooting for their junior in award show.