If it takes me more than 2-3 seconds to find the unsubscribe link at the bottom of the email, or if that page is anything other than a confirmation (nobody is forwarding your bullshit, you don't need to "confirm" my email address it's just intentional friction), I just mark it as spam. If I'm feeling generous I might let gmail unsubscribe me, but usually I will explicitly not click that just so I can mark all your emails as spam moving forward.