It also looks like the bulk of the bot/spam registrations came from just a handfull of (now banned) IP Addresses:

Example Username ---- IP Address
xfchbgfv ---- 218.106.90.38
vizirisuz ---- 79.120.55.82
BHhdNMGFb ---- 194.8.75.64
hdxbk666276 ---- 221.194.37.5
klmn254 ---- 60.168.93.12
JWLpWQUPV ---- 194.8.74.130
hdxbk666276 ---- 119.27.163.155