I just commented above, but it's really more like being a student at a university. You can enter all the buildings with your student ID. You can be friends with people in other dorms and enter the building. Even though you're an engineering student you can take classes in the economics or theater or applied science schools.

Though, IMO Mastodon not the better of the fediverse platforms, but I don't love microblogging social media. But it's all going to end up being like Linux. Some people tried it once, didn't like it, and then 10 years from now it'll be totally different and everyone will wonder where it's been all their lives.