Because it's not just about cookies. There are two laws at play, the GDPR and the ePrivacy directive. It's a mix of cookies, local storage, allowing the browser

Because it's not just about cookies. There are two laws at play, the GDPR and the ePrivacy directive. It's a mix of cookies, local storage, allowing the browser to load third party tracking scripts after information/consent, and data processing taking place on the server side. Simply solving cookies won't make the banners go away.