But I just can't understand
I can explain. BTCU is made by coinsbit team. Coinsbit is a scam exchange. BTCU = scam.
It seems to me that the picture is starting to take shape. You are on a cryptocurrency forum because you use cryptocurrencies for your dirty money laundering operations. Of course, in your activities (drug trafficking or terrorism), using cryptocurrency is the ideal solution. The puzzle starts to take shape.