@dansup at this scale, doesn't WordPress represent the same risk? I run 2 or 3 WordPress #activitypub that people can follow, while I can use them to talk to AP compatible implementation, it's not like WordPress invaded the #fediverse, even though getting a WP setup with a single user is a matter of minutes.

So if #Tumblr implement #activitypub in a way that turns each blog an actor of the Fediverse, it would just make something like @userblog@tumblr.com

Right?