That's a bad example, "programmatically unsubscribing" means giving spammers information that this address is alive. A much better solution is to report the unw

That's a bad example, "programmatically unsubscribing" means giving spammers information that this address is alive. A much better solution is to report the unwanted email as SPAM, so the sender's reputation takes a hit. (and for that 1% of the cases where the address is not a spammer and user knows it, they can just hit "unsubscribe" manually)