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Instance-wide rules always apply. https://legal.lemmy.world/tos/
To be clear, some really great community members have these names, but they're everywhere now. And with the right characters you can create some really annoying overlaps: https://github.com/LemmyNet/lemmy/issues/3790
Enough of them floating around now that I'll probably do a PR for my favorite client to filter them out.
They just look like regular text on the Boost app.
What is a standard character? It's not a simple question.
They're probably talking about a-zA-Z0-9, maybe _.-
What about äöüß?
Ï døñ't kńõ2w whåt ÿōû'rë tælkìng äbôüt.
They are probably yes, but the French might not agree since é isn't included. Let alone the vast majority of the world who doesn't use the latin alphabet.
This is a sticky situation, I really think your best alternative is to just block the people who are using stuff that's obnoxious. Programming wise there is very few ways that you can limit this without also limiting out non Latin based languages/languages that don't use A-Z. That being said I don't do much with front end I'm curious if it's possible to make a container in the client itself that Unicode characters can't escape from because it seems your issue isn't necessarily the use of the special characters it's the trailing style characters that are bigger than the display box