Yes, it's their freedom. Sad, but true, Piere.
Our only duty is to give them as much as possible information, recommendation or even bad examples like Sexy Cora (R.I.P.) or defective implants.
In porn (not modeling) world if they are once decided I doubt anybody can change it, like u said.
On the other side in normal life for example I know a girl (collaegue) who wanted to go plastic (she has medium big a little saggy boobs), she said she's not satisfied with the shape and feel (in fact she said they are all over her chest

). After some time she changed her bf and voila, she decided not to go plastic - so finally the reason was her former bf and current doesn't mind saggy tits - more the opposite, he likes them the way they are, she said..
Another problem is private surgeon clinics. They'll do anything for the money - if not the first one, then definitely the second, third,..there u go. That was btw the case with Cora.