Apps of all kinds, including shopping platforms, cashback, and survey apps, use this model. As a marketing tactic, businesses use refer-and-earn strategirummy gold 2es to increase user base growth and product promotion. Businesses gain new clients with this strategy, & users profit from the opportunity to leverage their social networks to earn incentives or extra cash. Due to the possibility of mutual gain, the refer-and-earn model has become more and more popular.