EDGX requested separate tax payment before allowing a withdrawal

I started using the EDGX trading platform and, after about two weeks, the account showed a profit of around 160,000 USDT. When I tried to withdraw, EDGX said the funds could not be released until I paid taxes first.

The platform said the tax had to be paid separately before it could report the matter to a cryptocurrency financial regulatory agency. It would not deduct the claimed tax from the balance already shown in the account.

I had already paid €8,200 because I believed the platform was legitimate. I am now concerned that the displayed profit may not be real and that the tax demand is simply another request for money.

I am asking whether anyone has experience with EDGX or can identify a legitimate reason a trading platform would freeze an account and require a separate tax payment before a withdrawal. I do not want to send another payment without independent verification.