The sports mentioned that are popular look like slower/weaker versions of the mens version, but they Ultimately do everything the men do. The WNBA doesn't look at all like NBA basketball, The woman can't dunk, they can barely shoot, they use a smaller ball, the game is played at a much much slower pace, it looks goofy.
You're looking for theories and conspiracies in something that's very clear, The WNBA is boring. The woman are off-putting with their complaining and demands, and It's especially off-putting when they're basically a charity league that wouldn't be able to operate without the chump change that the NBA throws at them to run their sorry league. The team names and logos suck, the advertising sucks, it's a poorly ran business top to bottom and there's no one to blame but women.
NCAA women's ball is popular because of built-in college rivalries and pride, not to mention the white savior Caitlin Clark.
Woman's MMA has more than just Rhonda, since her we've seen several divisions and champions rise to prominence, nothing as major as Rhonda but then again no man has hit the level of McGregor so even in that there's parity.
I don't know enough about woman's tennis but I know that before and after Serena the sport is still respected and treated as a legitimate sport with legitimate athletes. Basically, the WNBA sucks and all the reasons why are clear as day, no one wants to watch angry complaining lesbians slowly plod around a court missing shots and making lay ups.