Two things...
1. There ARE WNBA teams with NBA ownership still. Phoenix, Washington, Indiana, Minnesota, and New York (Brooklyn Nets). Also, Los Angeles is owned by the same group that owns the Dodgers (and Delta is the official airline of both the NBA and MLB). Las Vegas is owned by the owner of the Raiders, but the NFL doesn't have a league-wide deal. Either way, that's 7 of 12 with some pull.
2. Women's sports are a really untapped huge marketplace for business people right now. The VALUE is enormous, because it's a major pro league... with minor league expenses.
We saw the same thing with MLS. Dozens of people wanted to buy MLS teams, because it's the top pro league on the continent, but only has a $25 million payroll. Compared to the Big Four, that's a a bargain.
WNBA games on TV averaged 379,000 viewers, but ESPN is averaging 1.44 million for NBA games.
NBA averages 17,000 fans per game. WNBA averages 5,500.
That's one third the viewers/fans, but the expense of a WNBA roster is UNDER TWO MILLION BUCKS. That's 20 to 40 times cheaper.