Agreed. Any time I click an “Unsubscribe” link in an email, that takes me to a site where I have to provide my email or indeed, do anything more than click “confirm,” I leave. I assume it either resets some kind of consent trigger or sells my data to a new third-party vendor. The assumption of bad faith is now baked into my interaction with almost every corporate entity.
Thankfully most let you opt out with a single click - but if not I will put the whole domain in my killfile, so I won’t get any emails from them ever again
I think they’re doing it because of your exact behavior: one-click unsubscribe links are easy to do even if you’re on mobile and aren’t giving the process your full attention. Making you enter your email is a barrier.
They already know your email, I don’t see why getting it again would sell it to a new vendor. Clicking an unsubscribe link already verifies you are a real person.
Sometimes the people who set up the email service just forget or don't bother to add the receivers email to the URL parameter when you click unsubscribe, so it'll ask for your email again which is always an annoying step.