Sequelae of intermediary: refers to the phenomenon that users' personal information is leaked to other institutions and is harassed for a long time after receiving services from intermediaries. The following are the sequelae of the intermediary? ["Xiao Chen bought an air conditioner in the mall, and the seller notified Xiao Chen's information to the manufacturer. Xiao Chen received many calls asking about the installation time and location, and later he often received return calls for air conditioner usage.", 'Xiao Cai bought a house in a real estate development company, and then often received phone calls from the decoration company asking whether they needed home improvement. Xiao Cai did not plan to renovate for the time being, and was very disgusted with these calls.', 'Xiao Zhang found a satisfactory job through a headhunting company, but every day for the next few months, he would receive some unknown calls, recommending him "good treatment, flexible time, easy tasks".', "Pharaoh met Ding Mou who claimed to know a famous doctor when he registered for medical treatment. After seeing the famous doctor recommended by Ding Mou, his condition did not improve, he no longer ignored Ding Mou, and he no longer answered Ding Mou's harassing calls."]