Because taxis and cyclists are road users like others, car drivers also have to stop if a taxi has to drop off someone as long as it's quick. Same with buses, also. Or trams.
It's the same with pedestrians : if an old person walks on a small sidewalk, I will stop or slow down. Or if I see two guys carrying a washing machine.
As a pedestrian, I don't see cyclists stopping often when they ride on the sidewalk, though.
It depends how lively/busy the street is, but in towns like Paris, every day I would have to accommodate fellow pedestrians unloading trucks or doing deliveries in the street. The macha lattes doesn't appear magically in your favorite coffee shop.
It's the same with pedestrians : if an old person walks on a small sidewalk, I will stop or slow down. Or if I see two guys carrying a washing machine.
As a pedestrian, I don't see cyclists stopping often when they ride on the sidewalk, though.