The unsubscribe link often has dark patterns to try and defeat your attempt so I can see some getting frustrated and giving up. So maybe for the less technically inclined?
They've made it a lot easier, because now you're not required to sign-in -- which is why this product works.
I just pay my high-school sister $15/hour to manually dig through the links and check unsubscribe for each mailing list for you.
As a tech worker, throwing $5/month to saving me frustration is worth it. Sure, you're exposing your email -- but I'm also exposing my email on my personal website, and literally any company I register on.