Blacklists only produce false positive results. Filters only product false positive results. Those two methods are used by Akismet and BruteProtect. Simple Comments uses anonymous authentication, which results in zero false positives to block spambots and hackbots 100% of the time. I guess we should start posting our customer's spambots and hackbots blocked numbers, since that seems to be the trend.

Here's just one of our customers using Simple Comments to block 890,388 hackbots on the WP login form in just a few months, without any impact on the server's performance.