I felt the exact same way. Especially because I saw my email had been registered and leaked by some seedy looking conservative news site full of Trump propaganda. I always knew people could sign others up for junk "malicious subscriptions" and suspected that is what happened when I would get this trash in my inbox, but now seeing that other people can also see it very publicly is disturbing. How are they to know I didn't sign up for this myself? I'd hate to think people were thinking that about me.

EDIT: Seems like https://haveibeenpwned.com/OptOut does the trick.