[tomjen3]

I don’t know how often I have clicked the unsubscribe link only to find I am not unsubscribed.

Plus the link is always at the bottom in a tiny footer.

The mark as spam button has no such issue and hurts the sender to boot.

[duckmysick]

Another data point: since 2021, every time I clicked the unsubscribe link, I stopped receiving emails from those services.

I also haven't seen those email addresses passed on to someone else (I use unique aliases).