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Re:Hacking GitHub's Auth with Unicode's Turkish Dotless 'I' by msandford on Monday December 16, 2019 @09:53PM (#21810077)
Yes they can! It's their prerogative to allow people to sign up or not with any email address, full stop.

It might make them bad netizens and you may not like it. But the spec doesn't compel any behavior. It's just a way to communicate technical ideas and ideals.

Re:Hacking GitHub's Auth with Unicode's Turkish Dotless 'I' by hirsin on Monday December 16, 2019 @10:28PM (#21810249)
Precisely. This sketch always comes to mind https://youtu.be/hNoS2BU6bbQ

You're under no obligation to accept names that are hard (as in painful) for you (except if you're the police, I suppose. Ironically)