That doesn't explain why the delivery consistently jumps 30% to 50% as soon as you hit the confirm button and they process your payment. If they were giving an honest estimate, you'd expect a gradual increase in the estimate as the delivery person showed up 2 minutes late at point A, then 5 minutes late at point B, then 10 minutes late at point C, etc.
The Uber Eats delivery time estimates are a lie, plain and simple. Once they have your money in hand, they'll shamelessly admit to the lie, which is why the estimate jumps instantaneously.
also, you would expect to at times get over-estimated wait times. but my experience is always underestimated by about 20 minutes. so consistently, in fact, that I suspect they have a very good idea of the true time and then subtract 20 min from it.
The Uber Eats delivery time estimates are a lie, plain and simple. Once they have your money in hand, they'll shamelessly admit to the lie, which is why the estimate jumps instantaneously.