One of these is proprietary, so one option is good

I think the ActivityPub sphere needs to transition from “fedi replica of X service” to “Y component that would be useful to existing fedi services”.

Event planning is one of them. Simple, encrypted one-to-one DMs is another. Moderation tools is a big one too.

Would be a shame if each software has to independently reimplement the same features desired by each flavor of threaded reply service.

is there a tool that also works with other git forges like GitLab and Forgejo?