I despise these companies for pumping sugar into everything... however, understand that street drinks in those countries are plenty sweet themselves and can be less hygienic as well --street food is also very fatty or oily. So, both local and foreign chains or brands exploit sugar and fats but so do the mom and pop or in many cases, kid street vendors. The stuff sells and costs less.

In mexico they sell horchate in plastic baggies with straws --boy, are they sweet.