This is happening across the financial sector worldwide. We call it cross border regulations. Each bank however will have their own guidelines which may be similar or slightly different for each country.
Primarily HSBC PB is not licensed to provide this in Thailand. Infact most private banks are not licensed,but some choose to still do it despite it against the Bank of Thailand rules.
From bank side we are working on getting onshore license for PB activities but this will take time.
We can schedule phone or conference call?