There are all sorts of problems like this. What could you learn from the browsing history of people that work in sensitive areas? i.e. nuclear facilities, national labs, financial/industry regulators, etc. City and state representatives probably give away a lot through browsing. There's plenty of low lying fruit ripe for exploiting in huge ways.
Another avenue: merely knowing when someone is likely to browse the internet tells you:
-they're awake
-they're at home/indications of their location
-their level of awareness (think security workers or even prison guards)
Imagine being able to figure out the best time of day to hit a bank by browsing history? In an aggregate way you could probably figure out staffing (corporate level) or whether someone's home (residential level).
https://searchinternethistory.com/ (currently 500 errors)
I think it's only fair that these folks get to be the first ones to live in the kind of world they are creating. And none of them should have a problem with any of this, because I'm certain none of them ever do anything wrong and therefore have nothing to hide.
The big deal is when you drop a report full of embarrassing information you collected without their knowledge and they are powerless to stop it because of their own bill they passed.
But really, i don't think it would take very long to figure out where he and his staff in DC and in Tennessee live. I don't know what the data purchase rates are, so that could be expensive. But buy the data for a bunch of neighborhoods. Perhaps 50,000 people. watch the data for a while, query strings with Lamar would be good indicators.
Heck, make some really finely targeted ads on Facebook.
I think the reality is most news sourced this way would be super tabloidish. i mean, you're going to figure out what porn they look at faster than what policy they're developing.