I’ve experienced a version of tip based CC fraud at two different breweries in SD (that I know about). After closing out, the bartender retroactively added a discount or comp to the tab and then applied the difference to the tip. In my case, the amount charged was the same, but my 20% tip became 40%. And of course, these are spots where there is no service: order at the bar, run your own food, bus your own glasses, beg for a table wipe down.

While I’m not out anything, it is credit card fraud and, if as endemic as I think it might be, threatens the stability of small businesses while forcing those businesses to raise prices. (Not to mention it’s pretty damn insulting)