Often the promoters will claim to have “inside” information about an impending development or to use an “infallible” combination of economic and stock market data to pick stocks. In reality, they may be company insiders or paid promoters who stand to gain by selling their shares after the stock price is “pumped” up by the buying frenzy they create.
https://www.sec.gov/fast-answers/answerspumpdumphtm.html
The music should stop soon enough.