In January, a Wisconsin player (Xavier Lucas) signed in NIL deal and then left to go to Miami - outside of the transfer portal. Wisconsin is alleging that Miami interfered with a binding contract.

No idea if this will be successful. But, it calls the question on whether NIL deals are enforceable against players. If they aren't, then it is hard to imagine what rights schools actually have. Players can theoretically just leave any time they feel like it if someone else offers more money. 

https://www.espn.com/college-football/story/_/id/45552578/wisconsin-sues...