This is why you can't trust a company that says it gives you security and privacy from a DNS, DNS is someone's computer.

If you want security and privacy use Tor or if you have an Android use Orbot

https://www.howtogeek.com/295677/WHAT-IS-CLOUDFLARE-AND-DID-IT-REALLY-LEAK-MY-DATA-ALL-OVER-THE-INTERNET/