I agree that these gig-businesses cannot be relied on for emergencies, but within the 4 hours did you consider simultaneously using another delivery service? I would imagine that if you had access to Instacart, you would have access to other services like Uber delivery, Postmates, etc. Not to necessarily lay the blame on you because I probably don't fully comprehend the details of the situation, but I feel like if I relied on third parties so heavily to augment my own disability and had the price elasticity to pay an extra $50 tip, I would have many other contingency plans for events like these. If I can't get any help within 4 hours for a pet, how could I be expected to get help for myself or someone else close to me?