@1chemistdown ActivityPub is a public protocol just like every other Internet protocol. Individual server Admins, whether they run KBIN, Lemmy, Mastodon, Calckey, PixelFed, PeerTube servers, are free to block any other server that connects to ActivityPub. You have to ask the Admin of the server you're on or interested in joining.
Anyone else amazed at all the new magazines, blogs, and other instances that have appeared in one week. I just hope all you new mods aren’t resting on that stuff and will stay and work building this up.