The latest release is dated 2 days ago https://github.com/markqvist/Reticulum . Actively supporting is not the same as actively developing.

This should probably be taken as “I am tired of supporting everyone who did not RTFM, too bad if you can’t make it work” and is a totally reasonable thing to do, especially as the project gain more traction.

There is a pretty good community around reticulum that is usually supportive.

The reticulum project with the Sideband client is probably a lot more censorship resistant than DeltaChat or Meshtastic.