There’s the old saying “If you get a product for free, you are the product being sold”. So, free apps that give you money are likely making money selling your data (most likely very anonymously, contrary to what people will warn you. but be careful all the same) or through advertising being sent to you through the app. I have no idea how location data would be useful enough to sell for a profit (other than maybe verifying there are X number of people in that location each hour/day) but apparently it can be
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