The whole point of this app is that it's location-based - it connects you to people in the immediate vicinity.
Maybe I'm becoming an old fuddy-duddy, but I'm having trouble seeing what use this app is over a regular IM or texting session, unless you're toothing (which wasn't even a real thing).
People don't want to talk to random strangers nowadays, they want to talk to their friends, regardless of how far away they are. That makes the question of who's around you kinda inconsequential. I thought it had already been well-established people didn't want random folks to be able to message them. That's why every proprietary IM network makes people ask for authorization to add someone to their buddy lists now (I remember when AIM still didn't) and have controls to only allow messages from people on their buddy lists.
Just like the original sarcastic replier, I have to wonder why this bullied person doesn't just stop using the app and chat with their friends on some other platform they are all likely already a part of.