Second-hand trading platforms selling various “you know” products are flooded with banned items. Selling various "you know" products and passing the review in seconds are useless.
It is common to sell fakes, pirated copies, baby milk powder, prescription drugs, etc., as well as items involving pornography and vulgarity. Police equipment, fake certificates, etc. can also be retrieved through code words, which has become a hidden danger affecting the stability of social order and consumer safety.