negate a deal where the person/company handing out the money was deemed to have not actually used the Athlete's NIL for which they paid.
That still would not be a limit on NIL money as, again, SCOTUS has decided that the athletes themselves own their NIL. That decision is not being undone, ever.
How do you think enforcement would go on that? Who is doing the reviewing? How would they decide if somebody was overpaid for their NIL? What would be the punishments? Would the SEC and B10 accept it, or finally walk away?