Note that those cookie banners are required, and ever-present, in the EU since 2011 or so already (long before GDPR), so that's over a decade, what do you mean by "might go away when law catches up with them"? I'd be happy if they would go away by the way, it just seems very optimistic!

> The cookie banners are actually illegal

IANAL but the 2011 cookie law required to notify users about cookies, and banners / popups were at least at that time how websites could do that

They're probably referring to the common lack of a "reject all" in the banners that came about from the GDPR cookie law.