Wouldn't be too hard for them to do... just require a heartbeat to register steps at least every few minutes, and if the "swing" of the arm is too regular - stop counting steps. Even a marathon athlete will register different motion in the arm, that which a robot swinging the watch will not.
It's fairly easy to implement some AI to check for real human motion.
At the very least, they can discard the results of those obviously cheating on the final day.
But since this has apparently been happening since 2017, and it's now 2020... I don't think it will ever change.
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