Didn’t they do that years ago when the Diablo 1 and 2 devs formed their own studio and made Torchlight 1 and 2? And then went under because the games didn’t sell enough and the IP got sold to some shady company who made it into a weird, half assed MMO?
While David Brevik did move to GGG, he is not a dev there. He is an “advisor” and was originally hired to oversee their product exportation to China. Now GGG founded their company making games on the D2 engine, and were big fans of it, but I am pretty sure Brevik is the only D2 team member that went over, and he isn’t a dev there, at least not fully.