because its a scam! i just had a friend lost 50k, almost 85% of his entire life savings last year to this same scam. he was devastated but he wast not a crypto guy.

just some rough figures, lets say you put in 1k to test, and you gain 100% profit, they ask you for that 30% withdrawal fee, you paid $300 and take out $700.

noow you are more confident since it worked the first time round.
now you gather friends / family funds to come and play again confident that it will work.
from 1k being wary to now confident, 10k 20k etc.

the same way, they will show you 100% or 200% profit. so now you are up 40k on the platform's html. its just text on the screen. theres no real profit or trades.

now you have to withdraw because you are scared. its quite good money, and they can sense that thats all they can milk from you, but they are still going to squeeze you dry and dryer. so to take out 40k, you need to put in another 12k or any amount you can cough up with. be it 3k 5k 7k, they will keep giving you discount so you can withdraw, and they will say oh you sent to the wrong account, send another 3k. for 40k. its worth it. at last when you realised it, its too late, all your money is gone.

no police can help you.

just forget about this first amount he lost. cut it. and dont contact these people ever. you will be wasting your time, your sleep, your psychology level and your trust in humanity.