Doesn't it seem like somewhere out there is a company with a lot of data on people's walking speed, which could just bury these studies with orders of magnitude

Doesn't it seem like somewhere out there is a company with a lot of data on people's walking speed, which could just bury these studies with orders of magnitude more data? Some smartphone app or similar device for counting steps, or maybe just Google Maps when you're using the pedestrian option to plot your path.