> If you're a good engineer, there are better and far more interesting and impactful companies to work at than an app whose primary purpose is to call a ride.

Isn't the interestingness of the engineering work independent of the interestingness of what the company does? E.g., if your area of interest is large databases, would it matter if the company is using its large database to store car ride data, or to store physical inventory, or to store weather data?