>>472 is the person in charge of advertising posts blocking (Rock54 system) for 2ch (as well as bbspink)
He worries that there are lots of Child Porn DVD sales site ads in 2ch posted and its log says its hostname is "PIE.us" and worries about PIE server is used as zombie bots or someting.
I personaly think that one of your rental server user (which does not set reverse DNS lookup) hosts proxy server and posts these ads to 2ch though.
If you would like to obtain more information for tracking the offending user, please anchor >>472 and ask for it. (I will translate it, if needed, too.)
>>478 Rock54 system is the way of kicking advertisements as much as possible for 2ch/bbspink. The person in charge of Rock54 system receives reports at below thread from 2ch/bbspink users and register the new advertisement to Rock54 system.
So, it is not just for 2ch. bbspink receives the benefit as well. Rock54 system keeps logs of the registered advertisement for blocking purpose. And the person in charge of Rock54(>>472) finds the hostname "PIE.us" from the Rock54 logs and asked about the possibility of zombie bots inside the PIE.us server.