Iana.org Black Hole servers?

Isn't that caused by all the Windoze machines and misconfigured routers lauching reverse DNS resolutions on private IP address range across open Internet, that IANA blackhole servers are supposed to drop? I've seen somewhere that this traffic causes significant spikes exactly at the same time, like exactly midnight (GMT or local, I don't remember).

Please correct me, if that isn't the actual reason for IANA blackhole servers, dropping some traffic that was not supposed to be there, regarding reverse DNS queries, and if that couldn't be related to global alteration on latencies.