Yeah I asked this to dunzo ex head of product once during an interview, why incentivise long working hours when you have so many ppl in this country, most of whom are jobless, and can work 3-4 hours instead of 10-12 hours of excruciating shifts. He had no answer.
But the reality is it's all about exploitation. You would not attract anyone working 2-3 hours who will just earn 100-200 in that duration. Not are the customers are willing to pay a premium.
So exploit these drivers and keep their incentives in a way that they work 10-12 hours, earn a respecting daily wage(600-700).
With this incentive structure it's not gig work and i seriously hope govt regulaize this and provide basic benefits like paid time off, some insurance to these workers who are literally working for these gig companies.