FCC using to build own broadband maps
The FCC admits that the speeds collected are ballpark speeds. But then that isn't the main point of the data collection. The main point is they now have 1 more way to map broadband in the US and a way to help verify any map info they get elsewhere. They get an address(if you don't lie, but even that can be verified by IP location tools), an ISP vendor, and generally available speeds by location.
So, IMHO, they found a way to collect and or enhance broadband mapping data at low cost. This is something they should have initiated a long time ago. There are many that will criticize the effort for various reasons(most of which are invalid for the purpose the data is being collected). Exact accuracy of speeds is NOT the point.