How does the "AI sets the asking price individually, based on what info is available about the potential purchaser" play into this? AI setting the price leaves out a lot of the factors that humans use to decide if a price is good or bad.

Missing the bigger picture? The need for food banks exists precisely because capitalism fails to provide basic necessities to all people despite abundant resources. Celebrating more efficient charitable food distribution sidesteps the question of why such charity is necessary in a wealthy society.