Malwarebytes Forums
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Malwarebytes Forums's post in Special characters in Display Name was marked as the answer
I don't know about it being a security issue but it sure can make things difficult in some reports or when searching for certain items. Spammers love it too.
We settled on Aa-Zz [0-9] and _ for all names a couple years ago and that alone helped at least on a small scale to cut back on some spammers.
