Microsoft is basing the data on users of their services, which is largely a self selected group. Would it be surprising if people using Bing instead of Google or Duck Duck Go were the kind of people who use Windows, default to using Bing, and don't see the value of a high speed internet connection? I have older family members who fit this profile.
Last I checked Windows was still the second most used OS. I am sure Microsoft collects a lot of telemetry through Windows even when the user is not using Bing (or Edge.)
I strongly suspect that the data comes from Microsoft's MSN page. Video downloads is really the only usage scenario broad enough to generate such a data set. MSN serves loads of them and is the default page on Windows. Since their contents target the audience favored by advertisers (i.e. young urban folks with money), the data could have a strong selection bias. Rural Americans simply aren't viewing the pop-culture-centric materials on MSN.
