A while back a forum spammer decided to use my Gmail address to spam forum sign-ups. I got Gmail to filter most of them into the trash (the spammer used a variation of my email address I don't use. Gmail allows variations in email addresses). Afterwards I wanted to clean things up and a lot of the senders require that I log in first to unsubscribe. That they would sign me up without verification is bad enough but requiring that I login to unsubscribe made it just too difficult. So now I just filter everything that was sent to that variation of my email and mark them all as spam.
Lose-lose for everyone.