Sam 
For those wondering, this is how Calckey lets you add users to a list without having to follow them
There's a 'proxy' account that will follow a user and then the server just adds the posts to your list. Genius.
Mike Huntington@sam not so much genius but more so, that's just how ActivityPub requires a users outbox to be subscribed to in order to get posts. It's really an ugly solution to be honest and hopefully the ActivityPub spec can be improved so hacky solutions like this won't be needed.