Wikipedia is not saying it's not compliant, just that people don't use it because it's not required. GDPR requires that the user is able to refuse non-essentia

Wikipedia is not saying it's not compliant, just that people don't use it because it's not required. GDPR requires that the user is able to refuse non-essential cookies. A banner, if used, needs two buttons, "Accept" and "Refuse" or something similar. Refusing should be as easy as accepting. And you MUST not serve the cookies unless the user really clicks on "Accept". This means that by default your website must work without those cookies. So, if you want to honor the "Do Not Track" header, all you have to do is not show the banner at all, and don't use cookies that the user should be able to refuse. Done. You're compliant. Why companies don't do it? Because companies want to force users to accept tracking. Cookie banners are nothing but a dark pattern, period. GDPR doesn't mandate them.