what's the rarest invalid username on here?

i would think either @/wasteof.money or @/david (admin) but there might be others i don't know about

comments

wdym by rare

how little of accounts like those exist

there's probably a better way to measure rarity but economics

@$upercash might have made it into that list but it no longer exists

i would like to put myself in that list as well but there's an account with a space that's even rarer than this one