If I receive a newsletter and there is no way to unsubscribe without logging in and/or going through hoops, I mark it as spam. If I sign up on some service wit

If I receive a newsletter and there is no way to unsubscribe without logging in and/or going through hoops, I mark it as spam. If I sign up on some service with email+service@gmail.com and I get a newsletter from some other unrelated company, I mark it as spam.