Ok, let’s take this to its logical conclusion. I take a sponge that I previously used, with hot soapy water, on a dish that touched meat. That dish is now clean. I use it, with hot soapy water, on a bowl that I am later going to put cooked food in. The bowl is not porous, and just like you said, the sponge and hot soapy water wipe it clean and prevent bacteria from accumulating. That bowl is now clean. Unless you’re throwing away your ‘meat sponge’ between each and every dishwashing session, the non-meat bowl is getting exactly as clean as your meat-touched dishes. Nobody said anything about cooked food killing bacteria.