It did sound familiar at first...
Just keep reporting them, but there's an infestation of them for sure. It's times like these when I wish all new accounts were shadowbanned until their first post or so has been verified.
Personally, I see this looks a poor solution; admins/mods would get thousands of posts to verify, on top of their already existing workload.
Spam will always happen, but the luckily, every member can report it, so that mods can nuke the accounts.