Our company did something similar, but you could bring your own (like a Fitbit) and it would sync its data from Fitbit. The thing it didn’t check was the type of data it was getting. The Fitbit app allowed you to manually enter data, not just data it captured from the device. So this got sync’d to the company app as if it was actual data since it didn’t mark it any differently.

I would sit in bed at night and enter a random feasible number every time to hit my goals and get a cut of those sweet rewards.