“We tried to build [subscription management] ourselves and it was a huge mistake. We were running around chasing our tail every time Apple would change something or Google would change something.”

Don't build subscription infrastructure in-house — the iteration cost is brutal

Vince's engineering team spent significant cycles rebuilding subscription logic every time Apple or Google changed their billing rules — cycles that could have shipped features. Once they moved to RevenueCat that overhead disappeared. The broader principle: any infrastructure that is not your core product differentiation should be bought, not built.