I always felt like those click to unsubscribe links were nothing more than a "please prove to us with certainty that this is an actively used account so we can set a sticky bit on it and sell that info for $$$"
That’s a commonly held idea for spam emails. This is about services you’ve signed up and pay for on a recurring basis, and was targeted at companies who make it very easy to open an account, but then require byzantine methods to cancel.
It’s like browser popups that only give you the option of block or allow.
I want neither! Block means I add that site to a permanent local list and I really need no record of it at all.