There was a news story a while back about how some chain stores were not going after most shoplifters directly but would keep the recordings on file and press f

There was a news story a while back about how some chain stores were not going after most shoplifters directly but would keep the recordings on file and press felony charges once a certain total had been exceeded, so instead of getting a slap on the wrist for a few dollars of shrinkage here or there they'd drop the entire weight of the law on shoplifters once those few dollars added up to an amount that qualified for felony theft. Given that "just walk out" apparently means "replace cashiers with offshore video analysts" I'd wager Whole Foods might do something similar and policing shrinkage in self-checkout is too expensive compared to just keeping track of cheats and throwing the book at them if they make a habit out of it.