Not sure how many people are playing real tennis these days. But for most older established sports there are existing communities and apps that service them which make it hard to penetrate. Whether it's tennis or real tennis, even with badminton I have a hard time convincing groups to use it. The software is provided as-is so if people use it then that's fine, but otherwise I'd mainly target the ones I actively organize around so that there is actual usage. There's also not much in it specific to any single sport so supporting real tennis, however obscure it is, is basically free from the software side.
Not sure how many people are playing real tennis these days. But for most older established sports there are existing communities and apps that service them which make it hard to penetrate. Whether it's tennis or real tennis, even with badminton I have a hard time convincing groups to use it. The software is provided as-is so if people use it then that's fine, but otherwise I'd mainly target the ones I actively organize around so that there is actual usage. There's also not much in it specific to any single sport so supporting real tennis, however obscure it is, is basically free from the software side.