My son has celiac disease. Any amount of gluten man's him vomit violently for an hour. He's now old enough not to eat the playdo, but even the tiniest amount in his hands when he eats can be really bad. So I was happy this was available to ease this problem.
I also know hipsters will buy it just for eating it secretly at night in their basement because it's gluten free
Someone else said their child would have an issue with the playdough, so fair enough. But the sand? Why would anyone think that sand had gluten in it in the first place?
My teenage son and I both have celiac disease, but the rest of my family does not. We have to have separate parts of the kitchen for anything gluten related, including separate toasters. We have to wash our hands after handling anything not gluten free, otherwise we risk some low-level cross- contamination issues which can cause big issues for either of us. Been there, done that, did not enjoy my immune system attacking my intestines from it.
I get that this struggle is not well understood by anyone who hasn't had to deal with it, but allergies and autoimmune reactions (like celiac disease) are no joke. Having to miss school or work can be pretty devastating, not to mention the gastrointestinal issues that can cause those absence.
Sure, people can make kinetic sand. I can also make gluten free bread and cake. Quite often, the convenience of buying something is a pretty good thing if it fits the budget and makes it easier to focus on other things in life. So, I'm wondering if your point is more about anti consumerism than it is about pervasive use of gluten free labeling. I'm fine with that, but call it by what it is.