

I mean, most of the success of Linux comes from the freedom to solve local issues the way you want.
There have come lots of issues solved with a departure from the project from a need that drove the change. Want Debian without systemd? Devuan.
So yes, literally, if it’s important to you, you can fork it. Whether that takes a big lift or not doesn’t mean you’re any less free to do so.

Radicale was easy enough for me. Davx5 on android to connect to it, and that’s it.