I like the basic idea, and think it should be easy to build. You then could run with the idea, and maybe be able to provide this service for free and charge fo

I like the basic idea, and think it should be easy to build. You then could run with the idea, and maybe be able to provide this service for free and charge for something else. For example, provide this service for free and make money from tshirts and advertising materials the runners receive (or any of 100 other similar ideas) I know registering for runs is kind of a pain right now, so maybe you chose a good spot.