It makes sense that uber and lyft don't pay enough to cover depreciation; price falls to marginal cost for cheapest driver which is a casual irregular driver for uber who is using otherwise idle capital whose cost is sunk.
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The depreciation is sunk. It's amortization of the purchase of the car over time. Depreciation is an accrual accounting concept, important for financial reporting, but not a factor in business decision-making.
Resale value of a car with 100k miles on it, is less than a car with 80k miles. If you want to call that operating expenses and use the accounting definition of depreciation, you’re right. But my understanding is that the cost of operating a car is what takes Uber wages so low