re: Athletes can be sued for breach of contract if he/she transfers after taking NIL money

Using escrow accounts for a portion of their contract would make it a bit less likely a kid leaves. Offer the kid 5-10% more at the end of the day if they allow the collective to deposit 50% of their earnings in an interest bearing escrow account that is forfeited if they breach the contract. Once the season is over, the athlete can withdraw it all. Hard to pass up 5-10% more and the athlete can probably go to a bank and borrow against it. Then the bank is on the hook if they don't get paid back.

The collectives need to be a little more inventive if they are not going to sack up and sue these people.