Cynically, the unsubscribe button is so phishing operations spamming every possible permutation of {<plausible name>, <separator>}@<popular_service>.com can con

Cynically, the unsubscribe button is so phishing operations spamming every possible permutation of {<plausible name>, <separator>}@<popular_service>.com can confirm they hit a real email address and spam it out to all the various constant contact subscribers that pay them for leads.