The same is true for butter, yet nobody has any qualms about "peanut butter" not being made of dairy products. The term "oat milk" is clear. It is made of oats and resembles milk.
So why cheese? We don't really know.
Some theories:
- possible "germanization" of a Surinamese dish/product "Pinda-Käse"
- A product called pindadokun which literally was a block of pounded peanut that could be sliced, like with cheese
- When Calve marketed their peanut butter (Rising in popularity due to WW2), they were barred from marketing it as pindaboter, and instead used pindakaas.