Sometimes you should. Apart from it being zero-sum and this depriving other people of opportunity, with some of these services there's a promise of "starting f

Sometimes you should. Apart from it being zero-sum and this depriving other people of opportunity, with some of these services there's a promise of "starting fulfillment" upon acceptance. This is voided when a bot picks it up. Real life example: I ordered an Uber, which was accepted by a "driver" just two streets down. Except the car still hadn't started moving 10 minutes later. So I walked over, and the GPS signal seemed to be coming from a parked car, no driver in sight. Messaged and called the driver, but no response, even 20 minutes after acceptance. Had to contact Uber to get the cancellation fee back.