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.
Pssh. Celebrities on social media, who needs them anyway.
Like, say, if esteemed Academy Award nominated character actress Margot Robbie was on social media, it’d be utterly brilliant to choose to be on Lemmy, as no-one would believe it even if she went by her real name.
Personally I would find that highly amusing, a testament to having the soul of a true thespian.