I'm on a educator edtech email list where at least once a year, without fail, someone complains about how many emails they get and demands to be removed from the list.
Or, they are polite and ask for help unsubscribing.
It often becomes a wave of people replying, also wanting to unsubscribe.
There is literally a small area at the bottom of EVERY email explaining how to unsubscribe and giving a link to click to unsubscribe.
The problem is usually people.