Your questions about SoFi Hong Kong are answered here

There is no extra cost from us, if your fund withdrawal is transferred to your HK HSBC/BOC (HK) account. However, if the withdrawal is transferred to any other banks or via cheque withdrawal, we will charge HK$15/US$2/CNY15 from your withdrawal instruction or at cost fee (min US$35) if the withdrawal is transferred to any overseas banks.Please refer to our Fees and Charges Table for more details.