Users do not control the font. A content moderator reviewing flagged usernames sees whatever font the moderation tool renders. If that tool uses a system sans-serif (Arial, Helvetica, San Francisco), Cyrillic homoglyphs are invisible. If it used Zapfino, every pair would look different. The font is an uncontrolled variable in every visual review process.
Some of the objects discovered have already been shown to the public.
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If you've been a victim of child sexual abuse, a victim of crime or have feelings of despair, and are in the UK, you'll find details of help and support at bbc.co.uk/actionline.