User accounts are fragmented and just because you signed on at lemmy.world doesn’t mean your account exists on lemmy.ca.
https://github.com/LemmyNet/lemmy/issues/1985
Communities are fragmented and /c/games on lemmy.world is completely different than the one on lemmy.ml with its own users, set of posts, etc.
Lemmy does not currently allow for instance or user migration.
https://github.com/LemmyNet/lemmy/issues/3057
Nor does it allow for shared communities (ie the aforementioned /c/games is unified across multiple instances)
https://github.com/LemmyNet/lemmy/issues/3100
We are in the early days. If you’re eager feel free to join in the development on these any many other core issues. There’s real potential here.
And what if someone registers whoisearth on Gmail, Outlook, Facebook, Instagram, Twitter, LinkedIn or PornHub? Have you registered your name on literally every social media ever existed? This isn’t a new problem, or one that is created by the concept of federation.
As you are well aware you are giving examples of multiple different platforms not one single platform. Way to compare apples to oranges.
And before you try, this is not multiple platforms. It’s multiple federated instances of the same platform.
And being different platforms means that your identity is safe?
Federated services are like email. Just like your email address isn’t just “whoisearth” it needs the @gmail.com at the end to be the exact one to reach you, same as in Lemmy, it’s your name plus your instance that matters.