It is just finding products that claim to be sugar-free but actually contain sugar in the ingredient list. According to Article 55 of the Consumer Protection Law, if there is fraud against consumers, the seller should compensate three times the amount paid, up to 500 yuan.
Similarly, false advertising, like edible lipsticks, can also be considered as false advertising (there is no such thing as edible lipstick on the market, and it is also prohibited by law). Seeing it on Tmall Supermarket means false advertising, which can result in a compensation of 500 yuan.
(This is just an idea, um, don't expect too much...)