So someone's refusal to make a couple clicks to install an extension necessitates: 1) millions of users having to click to get the annoying popup off their screen, 2) installing an extension to block those anyway, and 3) a more fractured internet where website operators outright refuse to serve content because of liability? I'd bet a very large sum of money that the technologically illiterate don't read anything on those popups and click "Accept all cookies"
How does someone's refusal to install an extension necessitate millions of users having to close the popup? I guess you mean someone as in "vast majority of population"?