You are not considering that IP addresses are dynamic. Only your provider can associate your IP address with you, and thus associate the DNS requests that you m

You are not considering that IP addresses are dynamic. Only your provider can associate your IP address with you, and thus associate the DNS requests that you make with your identity. Cloudfare can't, because today you have one IP, tomorrow you can have another. And this without talking about providers that puts you inside a NAT, like it's common with mobile connections, where thousands of different costumers shares the same IP address, and thus only the provider can really log your DNS traffic. So if Cloudfare maintains a log of your requests who cares, that log is useless since they can't identify you as soon as you change your IP address. While using standard DNS the provider can identify you and can log all you DNS requests, even if you don't the default ISP DNS servers, since they can simply intercept and decode all the traffic on the DNS port. And not only your provider, everyone in the path between your PC and the DNS server, even at LAN level, for example in public WiFi networks like in airports, schools, companies, the administrators can log all your DNS traffic, and put filters on it.