The big difference though is LIV is just a handful of golfers. Football you need huge rosters, practice facilities, stadiums, coaching staffs, support staffs, training staffs, coaches, referees...
By the time you get to practice squads and full rosters you would need 350 (ish) players just to field 6 teams, which is a tiny league.
Way different from tossing gazillions of $ at a handful of big names like what happened with golf. The courses already exist and it's an individual sport for the most part.
Football is enormously expensive in terms of overhead, and you need a ton of players to make it work, which is why a lot of smaller schools don't have it.