That, and likely Meta users, since everything they own tends to have a deeply-ingrained culture of putting your real name and face all over everything you say and do. It IS going to happen. Pretty sure a couple on kbin already do, and there are more professional instances especially on Mastodon. It's a semi-common thing among eastern artists, from my experience.

Personally, I'm never going to do that and I see no reason it should ever become the norm when we have quite literally a limitless supply even if someone already took your user.