We were recently battling huge attacks of spambots. Again. Nor reCaptcha nor Q&A was working. Some fake users have thousands of posts and it was even impossible to perform batch deleting. Not the mention we have exceeded database limit.
This is why we have deleted almost all user after July 15. We have also deleted all users with 0 posts. We know this is not optimal and we are pretty sure we have deleted valid user and posts. We are deeply sorry about it.
We have setup new Q&A questions. Admin approval is also required now. We need to approve all new users so...Please use human readable user names.
Otherwise we can miss your user name in flood of fake users. So no "strcprstskrzkrk2335", ok?
Hopefully this solution is just temporary. We keep looking for better solution. If anyone knows better solution (yes we are so desperate), please let us know at firstname.lastname@example.org