well, here's the deal.
A long time ago we had sports. Women had some but very little. So this was deemed bad for women's development in a competitive world. So we created women's sports. Few cared except the women and their parents so it was underfunded. So we created Title IX, partially, so that women would have similar opportunities: separate, but equal.
Then society decided that people could recognize as a gender other than the ones they were born with. So that creates, really, a neverending panacea of sports categories. And, fact is, we have sports for man, women, handicapped, and others (short people basketball and old people golf for example).
Of course, anyone can get together and play a sport anytime they want. The issue really is MONEY! We recently saw the USW Soccer team successfully sue for equal pay to men even though the men make more TV and ad revenue. People saw this and said, "why not me?" So now we have this neverending continuum of different people wanting to have access to, or their own league and with funding.
The door has been opened. We'll have to agree on what categories get funded. That may be men and women at birth. The could be leagues by sex, gender, affiliated gender, race, size, age, and religion. Is sports protected by the constitution?