My specific goal in asking this is that I want to make posts sent to #Guppe groups publicly visible without needing a Fediverse account/client to view them. (The current Guppe server doesn't display posts.)
I read some issues on the Guppe repo, and it looks like posts *were* displayed but got removed because it didn't handle unlisted/private posts correctly. Sure enough, the code is just commented out:
I can use that!