> curious, how were these notices served to you when you were receiving them? Were they sent to the colo who forwarded them to you?

Yup, they would send their spam to `abuse@provider.tld` regarding an IP address, my provider would look up the IP address and forward it to me.

Presumably if they ever cared to escalate they could file a lawsuit and subpoena the provider for my identity, but they never did. They're looking for easy settlements and that would cost time and money.

Well, they did sue Cox Communications for a billion dollars because they weren't self-policing. ISPs can lose their safe harbor status and effectively become accomplices in all the piracy of their customers.