Picking bottoms, page-15

You said it yourself Zman or rather the data you gathered did.
"Check the app every day to see new offers and install them."
"Refer friends in addition to offers to earn extra"
"Watch out for "special offers" from time to time - we usually send out notifications for these!"

In other words tell your friends and build the customer base.
The more customers the more chance for revenue.
The more signed up customers the greater the price any company would be willing to pay for them.
Whatsapp was bought purely for the customer base.