Actual is libre and gratis

If you want you could add your device using this guide:

https://github.com/libratbag/libratbag/wiki/Adding-a-device/

(Piper uses libratbag to support devices)

You should still be able to access everything through tailscale once you switch everything over to use local IP addresses.

Is that unique to Joplin?

Agreed, if from a corporation. FOSS services are usually also gratis, and can be compiled from source if not.

You can block instances yourself, I personally don’t like when an instance makes that decision for me.

I don’t think “humanely” can be used in that context

Fair enough :)

Is Boost really that much better than Eternity or Voyager that you put up with ads?