slayerduck said:
spam bots we removed
The accounts themselves were removed from the website, not just banned? Why? I thought it was standard practice to just ban rulebreakers, I've never heard of removing their accounts. (What would be the purpose of that?)

And are you sure that that alone explains the situation of all the missing accounts? Again, there are no surviving accounts created on April 6th. It's highly unlikely that every account made on the 6th without exception was a spambot.

Edit: It also doesn't explain how we ended up with those repeat accounts for the same users with no associated IP addresses.