User blog comment:TimmyQuivy/Introducing the UserRenameTool/@comment-9605025-20180209023109/@comment-22224-20180209031034

To be honest, I'm not familiar with the exact mechanisms of AntiSpoof - you can read the extension page and the brutally long equivalence sets documentation for more information - but generally speaking AntiSpoof most generally blocks: substituting numbers for similar letters (ex. 0 for o), capitalization, and preventing a similar-looking Cyrillic character from being substituted for Latin characters (or visa versa). In both examples above, I can instinctively look at all the user names in question and tell they're different. Now, if I have to really stare at the usernames and try to figure out the difference, that's usually where AntiSpoof comes in.