I've deleted their accounts and their respective posts. It seems that they all register with a proxy, so it would be impossible to IP ban them. I'll make reCaptcha mandatory for registration soon.
theres better options that just a reCaptcha, reCaptcha is easily thwarted nowadays.
your best bet is to get a 3rd party addon and make some of the changes listed here
https://www.phpbb.com/community/viewtopic.php?t=1437125on another note, i'd also like the 2nd half of my launch pool bounty when you get around to it..