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.
If your email address is lostmymind@outlook.com, what prevents someone to create lostmymind@gmail.com and pretend to be you?
If it was widely known that outlook was the legitimate suffix, there’s no need to worry about this. If SAG-AFTRA had their own instance then any actor’s account username associated with it would carry the suffix chosen by SAG-AFTRA.
TomHanks@sag-aftra.com for example.
TomHanks@lemmy.ml would be instantly recognizable as illegitimate.
This problem already exists in many different forms and is already managed well by the fact that celebrities’ real usernames are well known and bullshit posts from accounts trying to fake them are easily caught just by looking at the user name. There are plenty of parody accounts on X with very similar username formats. Is that a major problem for X users? Not from what I’ve seen.
A difference between kbin (and mbin?) vs lemmy (and pyfedi) - the former would show the entire name, including instance. If instance was not included, it was because it was local (so you could assume ‘@kbin.social’)
On lemmy/pyfedi the name shows up alone - though you can hover over and see the instance name. But at a glance I can see how someone could get confused. Not the best UX IMHO.