I am looking forward to the day when food delivery transport robots fully replace human delivery workers, because the robots don't need to be tipped and have zero chance of spitting in my food if I don't tip them.

> don't need to be tipped

I was at a sports stadium last month and I went to get a bottle of water - the whole thing was completely automated. I picked up a bottle of water off the shelf, scanned it and presented my card, no human involved.

It still asked for a tip.