They want data on Internet use (and specifically broadband Internet use) by county. That isn't a trivial ask. You can get reasonable rates at a larger scale us

They want data on Internet use (and specifically broadband Internet use) by county. That isn't a trivial ask. You can get reasonable rates at a larger scale using survey approaches (like OxIS, the British survey series from the Oxford Internet Institute) but these aren't granular enough to compare small areas. Otherwise you're using some kind of proxy data. Your approach has two issues. First, people without Internet access are not in the sampling frame at all, which is a critical problem if you're interested in network access. Secondly, the geolocation in step 3 is also not particularly reliable (mine tends to think I'm 100 miles away from where I am) so you'll get the same kinds of problems they found here in that the data look kinda plausible but aren't actually reliable enough to draw defensible conclusions from.