When I left my apartment back in 2018, I was switching the Comcast account over to my housemate who was staying on there. In doing so I discovered I had a myname2342@comcast.com email account. The UI showed something like 8,000 unread emails. Bemused, I opened it to see what kind of spam it had accumulated. None at all! It was just under 8,000 DMCA / torrent warning emails from Comcast itself. "We know you torrented The.Pokemon.Movie.2001.h264.mkv, you better stop that!"

A full year of these emails and nothing more than that ever happened.

(if you're wondering how I hit 8000 torrents, the answer is individual album torrents)

This is called Speculative Invoicing, some law farm submitted a c&d and requested your subscriber information, Comcast hopefully threw the request in the trash but forwarded the complaint to you.