Absolutely, but there is one main difference: in those scenarios you do not communicate the tipping beforehand. A more similar scenario would be to go to a rest

Absolutely, but there is one main difference: in those scenarios you do not communicate the tipping beforehand. A more similar scenario would be to go to a restaurant, annouce that you will pay no tip, and then when you leave change your mind. The delivery person will be able to see your intentions of tipping zero, as nothing else is communicated.