> We will never sell your data or use it to target ads.
https://developers.cloudflare.com/1.1.1.1/privacy/public-dns...
> Cloudflare will not sell or share Public Resolver users’ personal data with third parties or use personal data from the Public Resolver to target any user with advertisements.
There's a lot of transparency on that page in particular, down to the lists of the fields in the logs.