Is DCGI legit? Why I keep losing under instructors advice?

In July, a stranger pulled Ms. Zhang to a stock exchange group. Because Ms. Zhang sometimes does stocks on her own, she is very curious, thinking it is fine to listen something about stocks. The group owner always said that everyone should exchange stock experiences with each other. He would send some opinions on stocks and some news in the group every day, and sometimes recommend some stocks.
Ms. Zhang’s stocks, which were bought according to the recommendation of the group owner Liu Hua, were all good and earned some money. After a while, Liu Hua said that stocks do not make money, and said that now crude oil futures make money, which is fast and has no risk. Then he explained the futures investment in the group, which sounds really good. Ms. Zhang also wanted to transfer the money from the stock investment and do futures together with Liu Hua in DCGI. Then the instructors taught them the operation process. On August 19th, Ms. Zhang deposited 300,000. In the previous few times, she earned some small amounts like hundreds, up to 3,000 or so at a time. Finally, she thought that this was a good opportunity to make a fortune, and then she deposited more than 500,000. This time, she was not so lucky. All of money was lost. Ms. Zhang lost 800,000 yuan before and after. At this time, the group suddenly disbanded. Ms. Zhang felt that something was wrong but only to find out their trap!