One could make a community named “Anon Posting” or something, lock it so only a mod can post, and then make the sole mod a bot that would post anything it got via DM (probably after automoding, rate limiting, etc) to said community.

I do think it’s a good idea for the bot to keep a log in case it gets abused for sufficiently evil purposes. One could add some extra functionality to the bot that would give identifying information about the poster to instance admins on demand (via DM), but I think instance admins would have pretty easy access to all DMs made to the bot, along with identifying information anyway. (Feel free to correct me if I’m wrong on that.)

Also, the bot could totally delete its logs and with them the identities of all posters after a while. Maybe a month?

And, of course, this wouldn’t be ironclad anonymity. But it would keep identities secret from anyone but the bot maintainer and instance admins.

Yeah, sounds like a pretty cool concept. Not volunteering to write such a bot (at least any time soon) or anything, but I support it.