Uh, email unsubscribe links started out great but are now really bad unfortunately :'-( The mailers do all sorts of tricks to make it really difficult to ubsubscribe. Eg, you think you subscribed to one newsletter but they actually subscribe you to many different actual subscriptions with your email address, and give them slightly different names, like 'XYZ News', 'XYZ Updates', 'Stay in touch with XYZ'. Then you are forced to unsubscribe from each of these one by one, and you don't even know if you got them all; there could be more that they could spring on you later.

There are now email unsubscribe services, but they don't really work either: https://www.nytimes.com/wirecutter/reviews/best-email-unsubs...