Why YSK this is that some of the soap absorbs into the fruit, especially berries, and let’s say you are washing your cherries with dish soap, and you eat them. That story ends with a long bathroom trip as soap makes you a little queasy. ETA: Nobody has heard about this?! I see it in the southeast where I live.
I wash fruit by submerging them for a couple of minutes in water and vinegar. Then I pat them dry and store them in the fridge in zip bags that I fill with CO2 from a soda maker.