It’s good for email and personal sites (those aren’t dead, but they’re more popular for people that either write a lot or are self-employed). I’d only use a personal domain for self hosted apps if the users are just you and your family.

For something like hosting Lemmy, with users you don’t know, I wouldn’t use the same domain as where you host your other personal stuff, even if it’s not your name.

There are multiple of us! I did the exact same thing, except for using my own name. Mine ends in .re of Réunion. I think it’s fun so I’m keeping it.

For sharing it offline I have a big text widget on my phone. They usually get it if they can read it, but not if I spell it out.