e.g. the QMK website links to a Discord server; but you'd only join that if you were interested in QMK.
For real, though, who though this is a good idea to do project documentation and issue tracking? It's stupid.
It's clear there's room for innovation in this space... something that democratizes Q&A but also where the answers aren't lost to oblivion come tomorrow.
I expect a tailored per-project chatgpt would help here. Let it read your discord, let github (or myproject.com) users search its knowledgebase directly: voila. curated user-generated answers to project-specific questions.
Imo we shouldn't have moved away from forums. Forums offer searchability, threads and allow community members to answer questions. Not sure why we collectively decided that forums are no longer cool.
There are also dedicated Discord search engines like disbord.org.