Premium Invest Solution suddenly wants me to pay a $2,100 "financial control fee"

I asked them why this wasn’t mentioned earlier—they said it’s “part of a final risk review procedure.” I’m skeptical,10 yuan futures trading platform app to say the least.I’ve complied with all their demands already. KYC documents? Sent. Verification video call? Done. Everything was supposedly “greenlit” last week. Now, this fee appears with no warning and no legal explanation. When I asked them if it could be deducted from my profits, they said it must be paid separately.I searched for this term online and couldn't find a single legitimate source mentioning “financial control fee” as a standard process. That’s a red flag.Honestly, I’m exhausted. This feels like extortion. Has anyone ever heard of this type of fee? Did you pay it, and if so, did you actually get your money? Or was it just another empty promise?