You can confirm this by looking closely at other apps in your class to see if there really is a scenario where you could get eg 4 digits of downloads in one day.
I also think it's a weakness that it's not available outside iOS as it would be very hard for any company to standardise around you vs something all their drivers can use. It may also be a drawback that drivers have to pay for you themselves, or are companies able to pay subscriptions for them?