I worked at a couple of major telcos at my country, and at the last one - where we had literally millions of active ISP and mobile users - we were approached by a company willing to pay for DNS resolver data. It is definitely a thing (and possible income source) even if you don’t do that kind of analytics yourself.

But I’m fascinated by the legal implications. Right now in Portugal sites are DNS-blocked for copyright reasons (IIRC without the need for what you’d call full legal oversight, just a sort of loose arbitration with the local equivalent of the RIAA), and this is going to play merry havoc with that.

(Uber’s website was also DNS blocked for a while due to hassles with licensed cabs, which was interesting because the mobile app never stopped working — can’t remember if it was an actual court order, but this should give you an idea of how technically clueless some people are over here...)