> People dislike usernames, they want to be able to choose non-unique ones rather than end up with user53267 or something inane. Google doesn't reuse usernames

> People dislike usernames, they want to be able to choose non-unique ones rather than end up with user53267 or something inane. Google doesn't reuse usernames so if they are still around - in a few decades pretty much all unique usernames will belong to dead people.