> I'd really wish for them to come through some community coordinated list of botnet infected IPs or something.

The problem is that IP addresses are not a reliable identifier, especially for the kinds of folks whose routers have been infected by malware. Few ISPs hand out static IP addresses anymore. It's why online games no longer bother with IP bans anymore, because as soon as the target reboots their router they evade your ban and some other poor sap on the same ISP gets stuck with the flagged IP.