Years ago an expert on RFID technology predicted to me that thanks to RFID tags, someday we'd all just load items into our carts and walk out, getting charged for the contents of the cart without going through a checkout process. That was probably 2005-ish and it's kind of surprising to think we aren't there yet, even with some other form of technology. Amazon has some cashierless grocery stores and I think they license their technology, but AFAIK it hasn't caught on (yet) in any big way.
Feel like Whole Foods/Amazon is there iirc. Not everywhere, but they have the tech in the wild I believe. Someone correct me if I’m wrong.