In relation to privacy, I remember reading that Quad9 is a good DNS provider and that Cloudflare although in theory is the fastest DNS provider has basically alone the majority of the DNS market, which is obviously a bad idea.
I also remember that recently Quad9 was fighting in court a case where a government wanted to block certain IP pirate pages but blaming Quad9 for “facilitating” them.
I know that both Quad9 and Cloudflare are recommended on PrivacyGuides but I wanted to read some opinions on that.
I run a PiHole and have Quad9 as the upstream resolver instead of the ISP. That was pretty simple to setup as well. You can also do DNS-over-HTTPs and other options as well for content filtering to block malware and items of DNS upstream.