I've seen advertising that is potentially deceptive. Listing potassium iodide as 'anti-radiation pills' is a gross oversimplification and it is, IMHO, potentially dangerous.

Potassium iodide is useful in blocking absorption by the thyroid of radioactive iodine. It doesn't stop, block or absorb radiation, and if the radioactive material you are exposed to is not iodine it has no protective effect at all.

Assuming what they are selling is real, a big assumption, it is a potentially useful product in very narrow set of hazardous situations.

I personally find it disconcerting that some people are hawking an otherwise reputable product with false and misleading advertising. Horrible that gouging and fakes are not uncommon.