Like mayonnaise, aioli is an emulsion or suspension of small globules of oil and oil-soluble compounds in water and water-soluble compounds. Many older recipes do not include egg, but nowadays, egg or egg yolk is the usual emulsifier

Purists insist that true aioli must contain garlic and no other seasoning (except salt).[12]

Kinda like claiming pizza doesn’t have cheese.

But yeah the majority of aioli you are eating will be mayonnaise based.