> It's like some people don't bother unsubscribing from lists, they just start reporting it as spam hoping it will go away.

I do that all the time. I consider every list I didn't explicitly and intentionally subscribe to as spam and treat them accordingly. I wish I wouldn't have to do that but I find subscribing someone to a list when they thought they were just buying or creating an account for a product so unnerving and disrespectful that I don't feel bad about it.