I think it would be great to have a archive so that the various documentation, comments and hacks / workarounds could be searched.
The reason I ask is because they block VPN traffic, restrict some content behind a login wall and I have blacklisted them from my DNS so I plan on never returning.
But I find myself lacking odd tips from the Sway community and other communities.
It is pretty busy but may already do some of it. You could request a nieche and very useful community like the sway one. Or use your own server to fetch these results and post to the open Web.
Unfortunately they don't take requests for new subreddits anymore. In addition, they don't mirror comments so in terms of answers to questions it's probably not that helpful.
As a sidenote, you can get around the VPN block with Redlib by just adding safe- to the start of most reddit URLs. So like instead of reddit.com/r/linux or whatever you can do safereddit.com/r/linux and it should work without needing a login.
Even if that's so, I have had many occasions where I thought that for something simple, ChatGPT could do the job. I ended up having a back and forth for hours (last case of that being yesterday) until I got it fixed. For most cases (but not yesterday's) I found it much faster by looking it up online.