This is all very confusing for me, too. I have an account here (posting from kbin), and one on lemmy.world. I assumed it was a good idea to make an official presence in as many of the instances as possible. So, is the fediverse just a content aggregator for everyone who officially joins it? How do you decide to cut off one or more of the different sites/apps if you wanted? I have a lot of questions I can't quite formulate. I have sort of an intuitive understanding, but I feel like a kid using the Internet for the first time in another way, too.