this is fascinating. i'd be interested in an anonymous dating app where i feed in my location and it matches me up with others... highly likely that if we like the same places then we might like each other (or at least, dating might be a bit easier)
There's actually a dating app with a similar-ish concept called Happn (https://happn.com/), which basically is Tinder but if Tinder only showed you the profiles of people you had actually crossed paths with in real life. Fun fact! Not exactly what you said but close!