Some types of pickles, sure, but often traditionally it's just lactic acid fermentation without any added vinegar. Half- or full-sour dill pickles are just made with a 3-5% salt brine and spices. The acidity comes from the fermentation process, not added vinegar.
The fermentation converts sugars to acids. You don't add the acid to the veggies. The bacteria convert sugars into acid and lower the pH.
This is why pickles (cucumber) and sour kraut does not go bad.