Great.
When the bar girl files her Thai tax return, she can indicate she received big money as a gift.
Oh, wait. She never filed, despite TRD allegedly having access to all overseas remittances.
Unless you are aware of bar girls filing taxes.
Editorial note: for some reason we get a lot of comments in the Thai tax topics that are disconnected from the real world, particularly about TRD auditing capabilities.
Thailand can't enforce helmet laws for motorcycles, let alone complicated tax laws.