The difference is that the car isn't fully consumed but can be reused. So the lessor has an incentive of maintaining quality of the original good. This is the same for apartments (AirBnB). In contrast, food get's wholly consumed. How does the original owner incentivized to maintain quality?
If anything, you should spin this off to create a marketplace for food bartering system.
This is an incisive and articulate explanation of my reasoning. Ride-sharing and food-sharing are different in a few meaningful ways that raise doubt that a food-sharing app should be premised on this analogy. Not only is it the case that the lessor (donator) has basically no incentive to maintain the quality of the food, but the lessee (recipient) may have no real way to evaluate the quality, other than to trust the lessor. It may be obvious when the food has spots of mold or smells expired, but it's not always that easy to tell.
If anything, you should spin this off to create a marketplace for food bartering system.