Thanks for the informative comment!

I apologize, I wasn’t entirely clear in my first two questions. They adhere to background checks for work. I’ll obviously have to spell out my whole username with @lemmy.world. But if someone who isn’t as well versed would find multiple durd_s and many have posted or commented something that wouldn’t be in good taste, this isn’t good for me.
I’m not sure if I’d be allowed to explain what the fediverse is and how it works.

Registering my username on other instances is possible, but not very feasible as there are quite a few instances already, and I venture that more are created by the hour.

I’m starting to realize that it’s only the links that are decentralized and not, what I’d hoped for but was maybe obvious, my data/account.

I’ve asked over at !fediverse@lemmy.world if anyone can register any nickname on any instance - essentially spoofing a user but on a different instance. Or if a username is “taken” across the fediverse.

Edit: anyone can register any ones username on a different instance. Spoofing/scamming isn’t handled very good?
Edit2: post and comment data is federated too, so your posts won’t dissappear, but might dis-converge(?) into multiple versions depending on things? :) This post helped me understand some of it: https://lemmy.world/comment/205763

I’d move to a closer instance, if I new they were in it for the long run and not shut down when they get bored after a few months. What happens if the instance I’m registered to decides to shut down?