Your earnings depend on your internet speed and location (demand for data in your area).
Rate: You earn $0.10 USD for every 1 GB of data shared on desktop, and $0.20 USD for every 1 GB of data shared on mobile.
Referrals: You can significantly boost this by referring friends (receiving a recurring bonus equal to 10% of what they earn).
You earn only while internet sharing is enabled and the app is running in the background.