I don’t fully understand how lemmy works completely yet. But for example I made an account at Division by zero and subscribe here to post. Is it not just a more inconvenient version of making a reddit account and being able to post practically anywhere?
Also what’s the difference between making an account at one instant and just making one centralized account for the social media?
The whole point is deliberate engagement and sharing. Don’t like the content coming out of an instance? Don’t federate with them. It allows communities to stay small and focused, or grow large and be a big tent, according to their users.