Yeah I’ve heard that a fair bit too - thankfully I’m a high-tolerance Coeliac meaning my body can handle very small amounts of cross contamination but for those whose bodies can’t process a single iota of gluten this has become a significant issue for them. I find that when I order gluten free a lot of servers will ask me “is that for preference or are you Coeliac” and that gives me confidence that when I tell them I’m Coeliac they’ll take extra precautions.