I figured if they were trying to be (terribly) "clever", they might go with one-MAC-per-product. Thinking about it more, that should be impossible since, as per the article, a single button can be used for a selection of products in that category, so it'd be possible that 1 Tide button buys one Tide product, and another buys a different Tide product, based on my configuration.
My fear was that they'd pick 1 MAC and declare "this shall be the MAC of Tide buttons", increment that 1 for Bounty buttons, etc etc
My fear was that they'd pick 1 MAC and declare "this shall be the MAC of Tide buttons", increment that 1 for Bounty buttons, etc etc