Of all things implied by Brexit, making business harder for AMZN and their sellers might end up boosting UK retail. Or maybe not, as everyone has to do the customs themselves. To me, characterizing this as a "bombshell" sounds like satire, ie mocking a proverbial Brexiteer sitting at home all day and ordering things on Amazon. OTOH, it's not plausible that this undertone could've been missed by Brits of all people.
