It has important features the other two don't, although some Mastodon instances are more relaxed about character limits, linking, titles on posts and editing. These are important features. But because the mother ship doesn't support all of them, it's hard to represent it without the limits. This can be fixed easily, btw. Just being analytic about it. I like Mastodon and ActivityPub because they provide interop, and that's the name of the game. Make your product but don't lock users in. Interop is your way out if you need to get out. ;-)#