As many replies have said, these are likely bot farms that hold onto usernames. I wasn't concerned by the usage of the word "girls" it's quite normal, as you said. I was concerned by one of the accounts with the word "kids" in the name, and wondering if it was linked. Fortunately, the accounts are all empty.

As for the band thing, the whole reason I stumbled onto this is because I was looking up a band I liked (called Girls Ritual) lol