They could, but individual sports are easier to poach. It appears the current plan is stop at 48 players. Can't do a start up league in a team sport with small numbers. Also, a golf tour doesn't need to build stadia or develop a fanbase in a particular town. It's a tour; so, they can pay a fee to random course to use their facility, and they are set (plus, since it's a tour, the players will play events in Saudi). Not sure how many basketball players would be willing to play in a league where there home games were played in Riyadh. Finally, golfers aren't under contract with the PGAT, they can simply resign and play for LIV. The best basketball and football players have agreed to long term contracts which prohibit them from playing in rival leagues.