90% of online business is a scam, platform that requires you to deposit money and refer friends before you can withdraw is a scam, you can't just join platform that you don't know anything about, someone just send you platform link you should deposit money inside without having any experience with it before, and you recharge the platform account. However, it is beneficial to take risks since if you do not, it would be difficult to identify a reliable platform. I'm sorry that the money you previously invested as a capital has vanished; don't try to send any dollars to them as fees; the platform is a fraud; and you should ponder before doing anything.
Business model an hype where platform build deposit money and get referral link as many possible and earn commission trough with how many member get. For OP cases he found wrong way with deposit fund and deduct fees until 10% because all exchange not take bigger fees actually for depositing fund. I think with many responds OP have been understood what have to do exactly some one ask him for paying 10% fees commission.
Many kinds way of scammer right now, I think have to be smart and ask to group cryptocurrency channel for beginner if required for paying fees when deposit fund to start trading. Don't be shy ask anything about rule in cryptocurrency actually about deposit and withdrawing fund due many scammer are waiting with some hasn't information about deposit fund rule.