Also note that if it’s just for personal use, you don’t have to have a domain for HTTPS. You can self sign, or create your own certificate authority, you just need to clients to trust it. But domains can be cheap or even free, so it’s better to get one so you don’t have to specially configure your devices.
I wonder if the process is open source or we just take their word that it’s privacy preserving. Anyway, privacy is not the only problem with online advertising, so I’m not going to give up adblocking any time soon.