What do you think of the spread of spam in social networks?

We may inadvertently reveal some of our private information, such as mobile phone numbers, which may be inadvertently revealed when we participate in certain activities, and then we will find all kinds of spam messages, and then when we browse the web here, some junk information will suddenly pop up, that is to say, it is obvious that these things are scams. I think he is driven by huge interests and he puts in so many advertisements. There is a person who believes that his cost will come out completely, so his interests and expenses are matched, and he can have corresponding economic interests, so he is willing to do these junk advertisements, which is absolutely suitable for all industries.