Spam and unsolicited emails in general are tiresome and costly. Spam is a giant pain in the posterior. With the possible exception of the spammers themselves. The issue that I have with this is that these email accounts seem to have devolved into a bit bucket for all of the detritus on the internet. Pay attention to your abuse email account lest you suffer the wrath of a ticked off incident responder. If you run any sort of site that necessitates such an address please please please monitor it for incoming email.”]
Source: https://www.csoonline.com/article/2136201/why-don-t-you-answer-your–abuse–email-.html