However, I think it is worth clarifying your following point.
>if Meta is paying you $750k/year that really means that you are worth twice that, if not more.
This is far from slavery. You are worth that to Meta. You might be worth significantly less without Meta. If you can make 1.5 mil/year alone and quit, meta wont send the slave patrol to bring you back in shackles. Instead, it is the golden shackles of greed that keep people making $750,000 instead of opting out.