If I was trying to incorporate in the USA, and the registration form would be unable to process diacritics, sure — even though that would neglect a large part o

If I was trying to incorporate in the USA, and the registration form would be unable to process diacritics, sure — even though that would neglect a large part of your own population (see the ASCII debacle) — but we’re talking about internet services marketed globally. I don’t think it’s too much to ask to have an app at least working as designed. We’re not even talking about translating stuff!