What industries are involved in the "black production" chain of selling user information online?

It involves real estate industry, training institution industry and fraud industry.

First of all, with the rapid rise of housing prices, it has become normal for more and more people to flood into the real estate industry. Most people who really want to buy a house will first ask about the price and situation in the nearest marketing center. In order to catch customers quickly, ordinary face-to-face sales have been unable to expand their performance. In recent years, telemarketing has risen. With the rise of this model, people pay more attention to protecting their privacy and will not reserve their mobile phones casually. Under such circumstances, the real estate industry will also purchase users' information online through some means to achieve its own profit purpose.

Followed by training institutions, whether it is off-campus children's training institutions, adult training institutions, or some yoga studios. In order to increase profits, they will obtain user information by some means. At first, parents were given small gifts to reserve their mobile phones. Later, through some community performances, people watching the performances were allowed to reserve their own information. However, with the improvement of people's awareness of prevention, more and more people are reluctant to reserve information. The profit purpose of these institutions was blocked, so they began to use some small channels to buy user information. Many users reported that their lives were affected by these harassing calls.

Finally, there is a more serious illegal industry, fraud. Criminals buy and steal user information through some channels, and then call relevant users. First, user identity information was reported, reducing Yonghui's suspicion. Later, he said that he was a law enforcement officer and helped solve things, but he needed to remit some money. Many users can't tell the truth from the false, which will lead to their own money loss. In this case, the market supervision department should shoulder the responsibility, intensify the crackdown on illegal activities and resolutely protect people's property safety. Banks should formulate a series of measures to prevent users from losing information and money.