I've heard that if you do a non-modal cookie banner, 75% of people just ignore it rather than go into it to deny cookies. About 12% (half of remaining) click accept all cookies. The rest close it again without taking action if they can.
I realize there are folks who go into things and customize everything on every website - most users I think don't care enough.
What's funny -> your ISP might be selling your browsing history. Your TV is selling your watching history and no one cares. But cookie pop-ups everywhere is all these privacy idiots can think about. It's performative privacy, that annoys the heck out of a lot of users and wastes a ton of time.