What industry in Taobao has many short messages?

The short message function of mobile phone is of little use, but when it comes to double 1 1 and double 12 advertising short messages, it is estimated that more short messages have been received these days than a year. When you reply to unsubscribe, spam messages will not stop, but will increase. It is said that this is a trap for merchants. Once the user replies, it proves that this number has been used, and the recommendation level will rise.