On the subject though, a bunch of veteran idol producers have set up their own shop, mostly as subsidiary labels to big houses. But none of them seem succeeding big.
BEP - STAYC
Ryan S Jhun - BugAboo
Shinsadong Tiger - Tri.Be
Who else?
But the same producers when associated with top agencies, deliver hits for their groups - IVE got songs from Ryan Jhun etc.
In that sense, YG, JYP, Bang Si Hyuk achieved impressive things - Successful Idol Producing CEOs.
YG and JYP even more as they are, Idols who became Successful Idol Producing CEOs.
Teddy - depending on how independent the BLACK LABEL was of YGE, during the early days of Blackpink.