supermarkets sell them, and some people must use them. For the catering industry, if you use genetically modified soybean oil, it is still oil, but some unscrupulous businessmen use waste oil. Some time ago, it was said on the Internet that a highly educated male god specially bought overseas (cheap) gutter oil for processing, and then sold it to the catering industry. Soon he became rich, but he didn't buy domestic oil to eat. His news included words and his photos. It is not known whether this news is true or not, but it has been reported many times that the catering industry used gutter oil. Therefore, if you do catering, even if you earn less money, don't do anything unconscionable. No matter how much money you earn, it's a thing apart.