Where is that the case? In eu at least that is commonly called like "contains naturally occuring sugars" and "no added sugar". "Sugar free" is more specific and should contain <0.5g sugars/100g or ml.

"Sugar free" usually implies that it uses sweeteners instead of sugar.

These are nutrition claims and they are regulated [0]

https://food.ec.europa.eu/food-safety/labelling-and-nutritio...