This is a recent popular scam.

Experts and professors inside, even the police, will appear. It's all fake.

Most products are of poor quality and low production cost. Some are even fakes directly.

The course content is also online.

Another is to buy one get one free, or buy one get two free, such as eggs and clothes. If you buy me a catty of eggs today, I'll give you a card or something. If you come tomorrow, I'll give you two catties for free. You buy me a dress the day after tomorrow, or an egg-like routine, and then I'll give you two or three the day after tomorrow. Do this for a while. At the end of the product, such as water purifier, it costs thousands of dollars each, telling you to buy one today, or double it tomorrow, and buy two and then four. This step is the last link. Many old people still buy them, and some even buy a few. They can take away hundreds of thousands of dollars on the same day. After hundreds of thousands of dollars, the liar ran away.

These are two kinds of scams that have appeared recently in China.