Mozilla have a special deal with Cloudflare. According to Mozilla it will give even more privacy. It also seem that there is no money involved? So hopefully Mozilla is not selling DNS like they sell search. But I still think its a bad idea to centralize DNS and send all dns request to one actor, then it becomes very easy for anyone like the US gov to collect the data.
Then there is also performance. While Cloudflare has great coverage, using your ISP DNS will be much faster, due to it being physically closer in the network and using a more simple protocol.
It says what they use, how they use it, how they won’t use it, who can use what (APNIC or if required by law), and how long they retain what. Your comment is misleading.
Cloudflare claims they "will never sell your data or use it to target ads."
You can read their 1.1.1.1 privacy policies here:
https://developers.cloudflare.com/1.1.1.1/commitment-to-priv...
https://developers.cloudflare.com/1.1.1.1/commitment-to-priv...