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.
it does depend on where you’re getting the fruits from and whether you’re in a first world country though