This is the correct answer. Takes a little bit of tinkering to setup but it's free and works. Just make sure to change the default DNS endpoints from Cloudflare and Google to something more private.
How about to set up a device that works locally at your friends' house as DNS server, but don't forget to install something like zerotier, so you can access it without setting up a port forward. With that, you can help them with the maintenance of their DNS server.
I would go a step further and use ansible to manage the devices. Set it up to auto update and you'll have basically no maintenance.
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