When you will try to withdraw your funds or your profit – they are trying to persuade you that for that transaction you need to open account in some bitcoin bank, to transfer additional money there (!) and buy bitcoins. Otherwise they allegedly can not return you money. The only good news is that you can retrieve your money if you contact a good fraud forensic expert. I did contact 𝙱𝚛𝚘𝚔𝚎𝚛 𝚏𝚒𝚗𝚊𝚗𝚌𝚎 𝚠𝚊𝚝𝚌𝚑 . Also they have no initial commission for their help, i payed was only after most of the money was recovered.