Easy to block that - though not with pihole exclusively.

We use another tool at our network edge to block all 53/853 traffic and redirect all port 53 traffic to our internal DNS resolver (works much like pihole).

Then we also block all DoH.

Only two devices have failed using this strategy: Chromecast - which refuses to work if it can’t access googles DNS. And Philips Hue bridges. Both lie and say “internet offline”. Every other device - even some of the questionable ones on a special VLAN for devices we trust work just fine and fall back to the router-specified DNS.

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Haroun and the Sea of Stories

All the Muderbot series

Old Man’s War series