To be honest, I dunno how spam actually works, I dunno how random people get my email but they all have that unsubscribe thing (Except the ones with obvious scams) but does it actually work? I have the idea it just more trouble than it's worth.
this is why i avoid clicking or following those unsubscribe links, it just tells them you are "listening" and they can verify your email is good to either sell to someone else, or spam you from a different placeIt just signals to them that it is an active email account and to ramp up their botting.