Someone shouldn't be able to have the @admin username
It's confusing for new users, and this instance in particular has 7k users but no interactions. It's a bot army, with the top user being called @admin.
What if a persons real name is Admin in some weird language?
A bit far-fetched I know. Still, I think that if theres gonna be a global hardcoded blacklist of usernames, someone should be very careful which words is added to that list. Each specific instance would know better what words is good and what is bad in their main language(s).