And guess what, it can be done just as easily, if not, more easily on a federated instance. You don’t gain at real additional control over your data (and no putting “covered under license X” is about as realistic as those Facebook posts saying “I don’t give anyone access to my posts”).
I’ve said this before and I’ll say it again, realistically the only way to control your data from AI is a DRM type solution which everyone fundamentally hates.