I would imagine it's the GDPR "ACCEPT ALL COOKIES" in big font and then in very small low contrast text "select some cookies" or "reject cookies" that they were describing.
technically, it's the ePrivacy directive. GDPR requires the consent to process personal data and governs the data but the ePrivacy directive is the instrument that requires that god-damn-please-make-it-stop-banner.
You're lucky to get a "reject" or "select some" button at all. Now I typically see "ACCEPT ALL COOKIES" or "Customize Preferences"