That’s always been a double standard.
Vince considers and pays his guys as INDEPENDENT CONTRACTORS, but, contractually, they can only work for him with no medical benefits, etc.
I don’t know about now, but as recent as a few years ago, there were some heavy hitters from the Fed that could accept third party bookings. But they had that stipulation in their contracts – many of them before making it big – and some were smart enough to work a similar clause into their renewed contracts.
Many wrestlers used to own their names and likeness as well.
Today we see less and less of that as Vince controls more and more.
These guys are supposed to be independent contractors, but...
You are told what to wear, whether you win or lose, how you win or lose, what story lines you’re involved in, you don’t own your image/likeness and cannot use your character name without permission, you can’t work for any other company, etc…
What’s so "independent" about that?