How did the police station know that I was cheated by the Internet?

I have to say that nowadays, the police are quite hard at fighting fraud. Pull banners to advertise, WeChat WeChat official account to push typical cases, send France to campus, send France to community, send France to market, short videos, sitcoms, anti-fraud apps and celebrity endorsements are all used. Now, big data anti-fraud is coming! The police station informed to understand the situation. One possibility is that the public security organs (not limited to local) have detected or are investigating fraud cases, and the relevant information involves me; Another possibility is that through big data analysis, the telecommunication company will push the relevant information to the public security organs for the target of crimes that are easily targeted by online fraud, or accidentally touch fraudulent websites, click fraudulent short messages, connect fraudulent calls, etc. Of course, there is also a case where the parties may have provided the suspects with auxiliary operations such as WeChat, QQ and Alipay account "unsealing" through online part-time jobs, and the public security organs need to know the relevant situation.