I haven't seen any verified models singing praise for a studios they're signed up with.
On the other hand, with some regularity, verified models pop up asking for advice on how to escape the studio they're signed up with.
Studio contract often have non compete clause.
Many cam sites put a limit on how many accounts a model can have, and how often they can create an account.
So leaving a studio usually means a model has to fight to get the old account closed.
And when they finally are allowed to create a new account many months later, they're basically starting over from scratch.