I think this is just an unfortunately reality of almost any public resource... my community just built a new pickleball complex, but there is still an opportunity for a private pickleball club that has an indoor space. Government is constantly caught in the middle trying to provide resources while also controlling costs and not wanting any project to look like a boondoggle or overspend.
I could look harder, but I think my local parks only have basketball courts and a large field. The biggest park in my town has a baseball field. Never had a public access tennis court.
There are tennis courts in town, but they tend to be part of clubs or whatnot, similar to golf courses. Not public parks.
Or they're always free of charge. I'm also used to there being dozens of free public tennis courts all over town, in multiple parts of the US, in both public parks and schools. I believe even the local private schools have courts that are open to the public.