Geez, the number of support requests I’ve sent to Strava over the years asking them to clean up their data. I don’t know about Android, but iOS can fairly reliably tell the difference between walking, running, bicycling, driving… They should be able to couple this with some better data science to filter things out like deliberate cheating, forgetting to set the right activity type or stop tracking before you drive away, or glitches in eg the GPS radio that result in huge changes in location or altitude, pushing you to the top of leaderboards with impossible results.