Fraudulent exchanges that can't withdraw and try to take more money with reasons

It started with the LINE group and was full of information on investment projects, but before I knew it, the topic had shifted to FX. And I began to interact with group members (sensei and Sakura). The amount of deposit and the number of lots are amazing. I thought I'd like to participate myself, so I made a deposit and kept winning. But when I tried to withdraw, it said that the amount of withdrawal would be limited, and tax would be charged. Or I would have to pay the tax on the exchange from this month to the next month. Ultimately, the registered account number was changed without permission, and it was said that it was the wrong registration. Furthermore, since the account was frozen, it asked me to deposit 50% of the amount in the account to unfreeze it. Also, is it possible to withdraw within the group? I shared the information of the fraudulent group on Twitter, they left me in no time. The group name is a gathering of individual investors such as A00 or B00. It seems that the role of the teacher and the role of Sakura are made up.