A decade ago there was a spider that used to crawl sites until a located a 404, then an automated spam email would be sent hawking their website services.
The org had name of something like days and weeks or hours. For some reason 24/7 keeps haunting me. I know I've some reference saved, however was unable to easily locate and was not willing to spend a lot time on subch nonsense.
Eventually the creator found a buyer for his spider and company and the email spam and spidering stopped.