Cost-effective marketing tactic: Businesses can use refer earn apps as a low-cost marketing tactic to help spread the word about their goods and services and draw rammy allin new clients. 4. . Trust and social proof: Users are more inclined to trust & use an app after hearing about it from friends or family, which increases customer satisfaction and conversion rates. Cons:1. Possibility of spamming: Some users may take advantage of refer earn apps by propagating their referral codes or links.