But they're not required to obey it, so they ignore it, presumably because they expect that more people will agree if they are annoyed with a dialog by each website they visit.
So while the dark pattern approach has merits to sites that want to track you, they must also be aware this is a balance. And a percentage of users will generally prefer to go to sites that leave them alone. That is: the cookie dialogue never widens the funnel.
Those cookie banners are illegal under GDPR, btw.
Real "Legitimate Interest" does not even require consent, and you can't claim that tracking or marketing is "legitimate interest". An example of legitimate interest is keeping your address in the records after a purchase, or storing a receipt for accounting reasons.
I suppose that is a matter that strikes a chord with me.