because it does not kill 99.9 percent of disease-causing germs (aka bacteria and viruses), as is deemed necessary by EPA standards for public health. That said, vinegar may disinfect some surfaces ...
Because the EPA regulates household disinfectant products, like bleach, they have been tested and clinically shown to kill bacteria and viruses - but vinegar is not an EPA-registered disinfectant.
These days, you can even purchase cleaning products that are already made of vinegar -- like Aunt Fannie's all-purpose cleaning vinegar-- but how well does this ingredient actually clean your kitchen?