Because let’s say you’re Tom Hanks. And you get TomHanks@Lemmy.World
Well, what’s stopping someone else from adopting TomHanks@Lemm.ee?
And some platforms minimize the text size of platform, or hide it entirely. So you just might see TomHanks, and think it’s him. But it’s actually a 7 year old Chinese boy with a broken leg in Arizona.
Because anyone can grab the same name, on a different platform.
It should work the same as email: you can trust it’s them if the user account is hosted on their own site, or their employer’s, or if they link to it from another confirmed source.
But look below in the comments. Can you even tell which of my comments came from Lemmy.World, and which comments didn’t? Some platforms will just show Lost_My_Mind. I can’t tell which platform @AbouBenAdhem is posting via. I just see AbouBenAdhem.
Use a better client that shows you the information? The default UI does, so that’s firmly a problem you’ve inflicted on yourself.
I’m just using a web browser that came with my phone. And if they were all hidden, it wouldn’t matter.
You’d just register your username. And this would be good for all the fediverse platforms. Once you register your innitial name, only you could register other services under that name. So it’s always you. Even if you never register for a service, you registered the name.
Then, if you register a new service, even years later, you still have your name.
Who manages that centralized service? What prevents it from being bought out, or attacked?
Because it’s not centralized. Every platform/instance just uses the same protocols. Any that try to go against that get defederated by all instances.
How do you identify them? Lemm.ee registers Tom Hanks, does every other instance have to check what information they provided to trust them?
What prevents someone to bribe a small instance to register a celebrity username on their instance?