AntiSpamMeta floods out when one user on a risky host joins many monitored channels
A user joined 9+ channels that were all monitored by AntiSpamMeta. Because the user had a risky host, AntiSpamMeta reported the same user 9+ times, and ended up quitting with excess flood, not to mention repeatedly pinging the operators of those channels.
There should probably be some sort of flood protection for this.