i am just a user (mainly on cb) but i am sure its very restrictive how this is handeled by the studios, because they want to earn from "their" models longterm, and it starts to pay off when they finally have build up their "name" and generated some decent room-traffic from regulars. thats the only reason i see so many models (especially from EE or SA) still (need/forced to ?) work in a studio, even after +/- years when they already reached some higher 5 digit follower-counts and already seem to recive some decent amount of tips within their daily shifts... in my opinion most of those models should already have trespassaed a point where they would be doing much much better on their own, if they would also get the cut which the studio will take away from them... but they seem to not do it because they will probably need to start over again under a new name from scratch, thats the only reason this makes any sense to me...
if i would be a studio owner myself, it makes sense profitwise. maybe if a model would really want to leave my studio i maybe would try to charge her a bespoken amount to release the "accountname" to the model, based on the earning-history of the account or just a flat fee...
while in the beginning working in a studio seem to be a very good thing for most of the models, because they have no costs and everything technically is cared about, the more time and energy will be invested, the more potential payout you will loose in the long run...
idk just my 2 cents, wish you good luck, hopefully somebody else got some helpful advice.