Pardon my ignorance but lets say that someone runs a typical cell phone jammer in the area, would that block the Bluetooth signal from working or are RF wavelengths not able to be jammed?
They'd have to specifically jam BT or all the public 2.4 Ghz band which includes WiFi and other protocols. Given that a BT jammer can be bought online for less than 100$, it's trivial to block this app over several tens of meters.