Corn syrup is fructose-free. What do you want them to put on the label? People avoid HFCS for the fructose in it. Corn syrup is glucose.

Corn syrup is one of the only plant-derived industrial-scale sweeteners that isn't substantially fructose. HFCS is made by adding fructose to it so it can be used as a substitute for high-fructose sweeteners like sugar, honey, fruit juice, maple syrup, etc.