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If your modem from your ISP allows you to disable its DHCP server and you could run your own, you could have each device on your network get the configuration. I suspect that Virgin is blocking every possible DOH provider. DNS resolution is such a core part of the internet experience. But like Jim said, if you get on a dodgy one or something and it's giving you back the wrong results, then you start getting stuff like the wrong Google results more as than you were before.