I forgot to update what happened to this issue. The maintainers had a PR with @Matomo ongoing, but they were planning on putting cookie-banners along too. I suggested that this could be avoided, if you make the analytics anonymous. And this is what happened.
Now all the #Carpentries main pages are Google free. The lesson styles were also changed, but they have not been rendered yet. Soon.
TLDR: Constructive criticism helps. The world is less Googly now.