Strava athletes are safer with fewer cars on the road and many cities have underused robust public transport systems. As Strava is a strong social media tool for many people, it could be used to encourage public transportation in a non-shaming way. You could post your bus rides (including walk to bus, bus ride, walk from bus to destination) and receive awards for most efficient ride, most dedicated/persistent bus rider, etc. If the app partnered with a city's bus system it could also suggest better routes or paths to the bus station.
