My HN username is also my gmail. I've got most of the stuff you mentioned, including unencrypted copies of US tax returns (with SSN) and house buying paperwork.
> I used to reach out and tell them I didn't sign up for their service. But honestly, after doing it for a few years I gave up.
Same here. It's surprising that most of the services don't use double-opt in before sending emails.
Some day, I want to use an LLM to identify those emails and label them.