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One thing I want to make clear! If you set your username to a domain, you can change it later without any loss to your account. Let me step through some scenarios:

i dont think there is anything inherently to bluesky unless they are limiting character-sets most domain registras dont let you use confusing glyphs, but its not illegal for a registra to permit it most browsers will alert the user, but the bsky app might not

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only option, perhaps, is to use some font face which clearly distinguishes between similar characters. like some monospaced fonts. but it is only a partial solution old twitter did this to differentiate between 0 and O, I and l and 1, and so on

A while back I tried setting a handle to a domain name containing an Γ₯, and Bluesky said that was an invalid handle and wouldn't let me. So there's definitely some character set limiting going on.