The problem wasn't that PIF offered the money. The problem was so many golfers took the money. We can make fun of the lower end talent they got but to get DJ, Phil, Brooks, and Bryson from the start was huge. If those players felt like they were willing to take the risk of jumping then things were not all sunshine and rainbows in PGAT land.I don't get this one. The problem was PIF offended players 10x more money that the PGAT couldn't afford. The PGAT HAD to change.
Most other sports leagues are fine right now, but If PIF wanted to they could do the same thing and make them look like they had major issues. Like Jay said, you can't compete against unlimited $$.
As far as the other leagues. Becoming an owner of a team is still controlled by the other owners. It is not as simple as saying that team is for sale so I am going to buy it. Of course all the owners are willing to make more money so if they came in with a good plan I could see the owners approving anyone really. If they want to start a rival league the problem is getting enough players to put a solid product out there. The contracts and unions the players are in currently would prevent the ability to poach enough players to be compelling. MLB would be the one league I look at that could be in trouble but as a player why would you ever give up membership to the players union? You are not poaching the guys under contract that would bring attention. Guys like Harper, Trout, Ohtani, and Judge have guaranteed money and have no reason to jump.