Those have banners because they have to by law, regardless if the cookies they set would otherwise require a banner.

https://commission.europa.eu/resources/europa-web-guide/desi...

> Use of the cookie consent kit is mandatory on each page of the DGs and executive agencies-owned websites, regardless of the cookies used.

Odd. I tried it in (what I thought) was a clean browser I use for testing, and didn't get a banner. Is it just me?