It's even possible to do dumb stuff in pursuit of a personal best without using an app at all. But it should be noted that the Strava user in question doesn't

It's even possible to do dumb stuff in pursuit of a personal best without using an app at all. But it should be noted that the Strava user in question doesn't seem to have been cheating. For some reason, they were trying to set a legitimate score in an ill-advised way. There's no evidence here that cheating in Strava is a problem. Is Strava promoting unsafe riding? Maybe. I don't really think so. But it's not connected to the cheating question.