People are understandably highly suspicious of DNS services and privacy issues with giant companies like Comcast, Verizon, Centurylink, etc. But I'd like to point out that there's a large number of small to mid sized ISPs where the final business management decisions rest with the individuals who also have 'enable' on the routers and core Linux/BSD server infrastructure.

There is such a thing as ethics in network engineering, and that term encompasses things like not attempting to MITM your customers' recursive DNS resolution queries, or monitoring/tracking/selling the data.