looks like there's been a lot of spambots here lately
maybe one of those pics with letters in them at the end of the registration field or a manual account confirm by the devs is needed to stop them?
there are several ways to stop a bot from getting an account.
for example, currently the Madagascar section is rife with them
looks like they originate from China; I can recognize typical symptoms that I've seen all over the online gaming community too when the so called "chinese farmers" overrun the place.
"And he piled upon the whale's white hump the sum of all the rage and hate felt by his whole race. If his chest had been a cannon, he would have shot his heart upon it"