As a bit of a pickle enthusiast, I must object to the idea that it is "vegetables in vinegar and not a lot else".
I was looking at making various Japanese pickles last year and rice bran with miso is a very common dry pickling bed; salt pickles are far more common than vinegar pickles (the recipe book I looked at had about ¼ of its pickles with some sort of vinegar, usually a rice vinegar).
Even vinegar-based Western pickles are far more interesting than "just vinegar", because most pickles have herbs and spices (pickled dill cucumbers have dill, garlic, and often mustard seed or coriander, sometimes chilli flakes). Also fairly common in Western pickles are wine pickles (not for cucumbers; sometimes used to finish the aging of sauerkraut) or salt pickles (preserved lemon, most sauerkrauts, the better pickled dill cucumbers).
And then you get the interesting pickles like Branston Pickle (more accurately called a chutney made with pickled vegetables, but…).
I also buy quite a few oil-pickled products from Italy; I suspect that many Mediterranean cultures use oil pickling over vinegar pickling. (Although the production methods for most of these would start with brining — salt pickling — they would be dried and the curing would be finished in the oil that they ship in.)