Also the mark read function is not working.

Haha sehr gut ;)

We also do this in germany

The best way to handle those devices would be to use some rules on the router or firewall to intercept all traffic to port 53 and give it to the Pi-hole DNS.

I use pi-hole to block tracking.

So if I use a hammer to create art I can’t protect it because I used a hammer? Exchange hammer for AI