@manton From where I stand, three things come to mind: (a) They created scarcity with that invite-code mess. That made the platform utterly attractive to many, as I had to learn - apparently this is more interesting than a system where you just sign up for any particular server and get going. (b) They seem focussed on replacing Twitter first and foremost quickly in many possible ways. Including the fact it's just one server which eliminates quite a bunch of issues that are ... extremely annoying on the ActivityPub based Fediverse (like lack of discoverability of users and content, incomplete threads and federation issues of all sorts, ...). And, hate to admit, yet (c): A lot of my old Twitter contacts, after spending a few weeks there, have been driven off Mastodon/Fediverse again due to an at times somewhat annoying reply-guy culture. Once you gain some visibility and/or dare to touch topics that are somehow "controversial" on your instance, it quickly can get ... messy and annoying over there. Seen a longer thread of a German journalist who posted a picture of himself entering a Zoom conference and that ended up in a really really "interesting kind of argument. 🙈 And, maybe another general issue which makes these hard to compare: Bluesky, again, is a larger VC-backed structure. They do have money for developers, operations and public relations / marketing. On the Fediverse side, Mastodon seems the only structure that is sort of an organization, and still I guess it's nowhere near what Bluesky PBLLC is as a "company".