If you use a gmail account, how do you know when someone subs you to a spam list vs just having a gmail account? It's incredible how fast a new gmail account starts receiving spam.
I have a old Gmail account from years ago I don't use as my main account anymore. It's amazing how much spam messages it gets. I swear my main account with Fastmail receives a tiny fraction of the spam despite the address for that account being available in plain text in mailing list archives and the like.
Remember, it's a feature, not a bug. Cynic me suggests that when you register a gmail account, G autmatically sends that out to all of its ad buyers. "It's a twofer!"