I've been using my pi-hole as my DNS and then also firewall blocking the TV from phoning out on port 53 in case the manufacturer has hardcoded DNS. Though I agree with the point and I shouldn't have to do this. This is just mitigation.
At the very least, i would assume the majority of folks here were pi-holing devices on their network.
>and then also firewall blocking the TV from phoning out on port 53 in case the manufacturer has hardcoded DNS
I'm surprised they haven't switched to using DoH, which would prevent this from working.