What is your best argument against college football players being banned from selling their NIL? I don't consider "it's different than how it used to be" or "I don't like it" to be cogent arguments.
IMO, if you don't want college athletes to be able to sell their NIL, the sport needs to go back to what it was when the NCAA was founded 100+ years ago, which is basically glorified intramurals. Their rules of amateurism make total sense in that case.
If you want the modern version of the game, with 100k seat stadiums, every game on national TV, fan paraphernalia for sale everywhere, etc., it's really hard to justify why they shouldn't be allowed to make some dough by appearing in an ad on Instagram. NCAA rules barring players getting paid kind of lose their point once the sports in question start generating billions of dollars.