On top of that, many implementations don’t even respect users’ decisions anyway and set cookies despite their choices, assuming that most people will grant consent regardless. Admittedly, they aren’t entirely wrong. In our research, the vast majority of users willingly provide consent without reading the cookie notice at all. The reason is obvious and understandable: many customers expect that a website “probably wouldn’t work, or the content wouldn’t be accessible otherwise.” Of course, that’s not necessarily true, but users can’t know for sure unless they try it out. In reality, though, nobody wants to play ping-pong with the cookie consent prompt, and so they click the consent away by choosing the most obvious option: “OK.”

https://www.smashingmagazine.com/2019/04/privacy-ux-better-cookie-consent-experiences/