How do I know the top 100 items listed as "Bus Stop" aren't someone's malicious raspberry pi hidden in the bushes, spitting out hundreds of URLs and varying the signal strength so they appear to be coming from different locations and...wait a minute. I think my phone just got DOS'ed.
You will never stop DOSs. It's trivial (I imagine, can't think why it wouldn't be) to DOS someone's cell signal. Allowing users to see which items are "certified real" and not raspberry pis in bushes is an easy engineering problem we've solved in a number of different contexts.
