[ErroneousBosh]

They're using a VPN.

I've never seen anyone using a VPN for anything other than disruptive behaviour. I had to block vast swathes of mobile broadband providers in a certain warlike Middle Eastern country because if I didn't I'd have anywhere from 100 to 1000 new users every single morning who'd all posted hate speech that won't post here for fear of triggering the right-wing apologists.

Now they just do that over VPNs, which makes keeping them out all the more difficult.