How are these things not banned? If something is sold for casual private use that predictably leads to hundreds of people having metal barbs stuck in their thro

How are these things not banned? If something is sold for casual private use that predictably leads to hundreds of people having metal barbs stuck in their throat every year, and if the procedure to extract those barbs is sufficiently difficult that it has become recognised as a national problem among surgeons, then there seems to be pretty good grounds for banning it. As this thread attests, there are plenty of alternatives.