Ryan smith is one of multiple BYU donors who are billionaires. From what I understand he isn't the top contributor to BYU NIL collective.
Another note, from the beginning of the AJ recruiting battle process all universities in the running agreed to the requested NIL amount. Apparently there was no bidding war that BYU won. NC, Alabama, BYU, etc were all offering the same amount of money (the amount AJ decided on). He choose BYU over the other contenders based on non financial reasons (according to AJ he chose BYU primarily based on the coaching staff being the best at getting him ready for the NBA)