My friend is doing part-time promotion, sending three articles a day for 30 yuan a day, and sending them to friends circle. Then the question is, how does this company make a profit?

Your friend must have paid a deposit when he did it. As for the profit, I tell you clearly that this is a scam. First of all, the top management will develop many offline companies to attract more people. Suppose a person is 200 yuan, then his salary will be available, and then his circle of friends will be all kinds of pictures of salary drying, thus attracting more people to join. After you have worked for a period of time, his senior management will tell you what the good news is and which companies are on the right track.