> DNS is used by ISPs to sell user's data Claims like these keep surfacing in every discussion. While it is good to contemplate what your ISP spying on you wou

> DNS is used by ISPs to sell user's data Claims like these keep surfacing in every discussion. While it is good to contemplate what your ISP spying on you would look like and what you can do to minimize that risk, it is not good to present this as normal behaviour. From my perspective I am absolutely certain that this is not something that is routinely done, not in established ISPs in democratic countries. The risks would be far too great for a tiny income. Who would you sell to? The advertising networks have their own data sources, and even the web giants with billions of users and trackers embedded in pretty much every web page you visit can't charge much. Even if you wanted to do this, DNS would be a low value target considering it is cached at every layer. Data mining sFlow logs, which is something every ISP would use anyway for diagnostic purposes, would give you better view of which kind of services users connect to and for how long. So please don't normalize something that is at best a niche for bad actors. That can lead to decisions for end users, many of whom would be wiser not sending their data off to a foreign third party.