I founded an anonymous social media platform in the past. It can be a real pain because once identity/accountability is removed, people tend to act very poorly. On paper, I like your idea of helping people to form risk-free connections, but it is very possible for your platform to spin out of your control. The small radius location nature of your app will likely mean a lot of negative press and/or police inquiries about stalking, harassment, threats, bulling, maybe even rape or murder in the extreme.

Not trying to be negative; I know your intentions are good, but be please be prepared. When the police call you in the middle of the night, and they will, make sure you can provide whatever information you can to identify the users. I am actually surprised you would be able to get into the Apple store without being able to do so.