As far as I know, PGA Tour provides benefits, such as a pension plan and health insurance. The players are independent contractors up to a point - they can pick and choose the events they want to play on the tour but they have to maintain a certain level of performance or they lose their playing privileges.
Just a quick look-see. In 2021, the 150th ranked player in the official money stats was a guy named Vaughn Taylor. He made $649,000 over 30 events. Assume $10k per event in costs, which might be low, his profit was almost $350K. He probably had some additional revenue from clubs/balls/clothes plus he probably does corporate outings when not playing a tour event.
So the average guy does OK, but it's a grind, trying to keep your game sharp, the travel, away from family. It can be a tough road. Guys below 150, for the most part, simply aren't making it and they lose their playing privileges. Those are the guys who need to look for different employment.
The LIV tour has so much money behind it, it is too compelling to pass up, particularly for the guys who are on the downside of their careers, because it's damn hard to make it as a PGA tour player.