The OP didn’t explain or showed the unsubscribe button compromise trick. Anyone here can shed some light on it? I always had the habit of clicking on the unsub

The OP didn’t explain or showed the unsubscribe button compromise trick. Anyone here can shed some light on it? I always had the habit of clicking on the unsubscribe button whenever I see an unwanted email. And I’d like to know what would happen if I click on malicious unsubscribe link.