Perhaps because people are encouraged to choose their snacks largely from those lists. But if you go to the Atkins website and put "snacks" in the search engine, you'll find things listed that they would consider good snacks (note that not all of them are appropriate for induction such as berries and nuts) but meat strips or jerky are listed and pork rinds are not too far of a stretch from that. Perhaps it's a bit more intuitive..as I mentioned above..they are not much different from crispy bacon, contain no carbs and are a protein/fat product. Protein and fat are both allowed on induction, pork rinds are nothing more than protein and fat, therefore pork rinds are allowed on induction. The flavored ones you need to be careful of because they sometimes contain sugar and have carbs, but the unflavored ones are allowed.