If some banks but not others are doing this, then it is cleary NOT the Government.
Are these restrictions for foreigners only, or bank policy for all customers?
The foreign income remited here applies to ALL. Thais are more likely to be remitting money on which they have not paid tax, unlike most foreigners, and will ceratinly not have any DTA, unlike many foreigners.
Global income taxed? Like the Good 'ol USA then? Maybe that's where they go the idea, if it is even an idea in Government as poososed to come internet conspiracy drummed up to foster ill- feeling towards the Thais, or their Government, or both.
PH