You'll learn how they leveraged an existing audience, built out a referral program, and rewarded people for telling their friends to dramatically lower the cost of their app launch. 

Mass adoption requires simplicity. If you are going for a mass market like the payment app space you need a dead simple message with a value proposition that's easy to explain.

You need to overcome objections. With a financial product people are going to be skeptical. Doubly so if it's a space like crypto. They needed to explain how a users money would be safe. 

Early access waitlists work. "Having an early access leaderboard/waitlist worked pretty fantastically to get people sharing and referring friends." 

Beta testing is a reward. People who are enthusiastic influencers are also the same people who want to be a part of your team and give great feedback!