Except no, that's not right. There is a difference between what cam sites do, which is classify all model material as work made for hire, and what all of the rest of the internet does, which is utilize a nonexclusive license agreement that has all the power to cover exactly what you're talking about, but keeps the ownership of the intellectual property in the hands of the creator (the model.) By calling material work made for hire, the cam sites make claim of outright ownership of that material. It's dirty tricks, and is dubiously legal, really. I mean, who owns the rights to a feed that's simulcast between two separate cam sites that have the same for-hire clause (and they ALL have that same for-hire clause)? Are independently-produced photos and videos that are posted on a model's profile also considered works made for hire? How the hell can these sites even uphold such a claim? At worst, it's predatory use of law. At best, it's wrong-headed and largely useless. Either way, it's not good news for models, who should rightfully own the content they are providing.
To answer your question, Lexi_Nova, I have yet to run across a model agreement that hasn't had the work for hire clause in it. I think "keep your rights!" would be a good selling point for a startup cam site, but so far, nobody has taken that leap.