If enough users press "unsubscribe" to a sender, and that sender doesn't stop sending them emails, this is a high quality signal that the sender needs to be blo

If enough users press "unsubscribe" to a sender, and that sender doesn't stop sending them emails, this is a high quality signal that the sender needs to be blocked altogether. If GMail's response to this kind of signal is aggressive enough, it also gives an incentive for legitimate-ish senders to offer one-click unsubscribe links, to decrease the number of cases where someone presses 'unsubscribe' but then doesn't jump through some second hoop. So yeah, I'd say this has some advantages for dealing with a wide range of scum.