I'm exploring the ActivityPub protocol, trying to get familiar with it. When I query the "lemmy.ml" root (as an example) the outbox is listed as "https://lemmy.ml//site_outbox", which doesn't exist. But querying "https://lemmy.ml/site_outbox", which does exist, just gets me an empty list.
I know there's a way to get a list of communities from "https://lemmy.ml/api/v3/community/list", but that's using Lemmy's own custom API, not ActivityPub.
Okay, but this is the problem the fediverse was created to solve. If someone starts doing dumb things, we just defederate from them. No need to freak out about it.
The only thing this does, IMO, is highlight the need for easy instance migration, just in case the one doing dumb things is your own instance owner.