It's completely a disease of our culture. Not very many generations ago, you had to find work that actually produced something, and your paycheck somehow reflected the measure in which you helped that product to have value. Sports grew out of the idea that entertainment has value, so sporting people were paid according to how much entertainment value there was in their sport in general, and in their team and/or their own performance individually. This all made logical sense.
The US women's soccer people sued for better compensation from the US soccer governing body, and they were right, actually. Because the women actually won, and international soccer is basically about 2 global tournaments (World Cup and Olympics), the women's popularity was much better than they were being compensated for. Also, in some way, that was a representation of the nation, so equal rights apply.
What has happened now is that, within the free market, there is a demand for equality regardless of the benefits which the particular person brings to the situation. Employees wish to be paid just for being there. There is not as much "pride in my work" spirit as there was a generation or two ago. So, the link between value and pay has diminished as it is viewed by society in general.
This leaves an opening for organizations like PWHPA to arise. Their line is, of course, that's is somehow not 'fair' that men can play a game and get paid, while women can't make a living doing the same thing. The expectation of 'fairness' totally ignores the market side of the equation. This would be fine in a "US Olympic Team" arrangement. It would be fine on a college campus. Neither of those are situation which require value back from entertainment customers.
However, in professional sports, the situation is NOT that of a non-profit organization. At its foundation, sports is entertainment. That means that whatever game is being played, there is no value if no one wants to watch it. People don't go to football games or basketball games thinking "I want to make a donation to the players' union." They go to be entertained. It's about the experience.
Ignoring this creates an artificial world and an artificial society.
Beam me up Scotty.....