So basically instead of hundreds of different DNS systems, all an unsupervised person in government or law enforcement has to do is search one or two distinct D

So basically instead of hundreds of different DNS systems, all an unsupervised person in government or law enforcement has to do is search one or two distinct DNS services for all your queries over the past years. They can claim all they want it's not logged or anonymized but that's like believing the same claims by your VPN service, you have no idea if they are operating under a silent security order from some agency. And unless I am missing something, unless you are tunneling though VPN, proxy, etc. your ISP is well aware of every IP connection you do, they simply just rDNS if they want to know.