When I moved out of my apartment I needed to transfer the Comcast account to my roommate. In the process of logging into their web dashboard for the first time since I'd started the service, I found out I had an @comcast.com type email address, apparently registered for me. The webmail UI indicated I had thousands of unread emails. I was curious what kind of spam gets sent to an email address that's so far as I'm aware never out on the internet anywhere, so popped it open.
Thousands of DMCA requests. Full filenames. Over the course of a year they had apparently notified Comcast of thousands of alleged violations, and nothing more than an email ever came of it.
Impossible to know which roommate was allegedly torrenting files of course. Or perhaps people visiting using our wifi. Who knows!