[moribunda]

Basic SEO stuff, you have marketplaces that check history, you have domain search engines aggregating data from multiple sources - not only ahrefs.

Checking web archive is a basic operation to test if site was hosting anything fishy - not only pirated stuff or porn - often websites has been hacked and changed into link farms or simply were bought on aftermarket simply to use it's SEO value to pass the strength to other domains.

Anyways good point regarding email filters.