Isn't it true that if you make a profit, there won't be any deductions?

I have been under contract for several months without ever losing money, but finally encountered a clear scam. At Bibit, there’s nowhere to file a complaint. They say they don't care about the fund calculations, but when it came to selling, I clearly saw a profit of 400 at the closing price, yet ended up with a loss of 5300. Later, I had a colleague try it out again, and tomorrow he lost 1000 and sold at a profit of over 200. There was also a strange fund fee of over 600. It’s a miracle that such a bizarre coin can survive in the crypto world for so long. It should be banned.