Here’s a table comparing the tax systems of different countries on how they tax local income, foreign income of residents, and foreign income of nonresident citizens. The Philippines is noted to tax residents on foreign income, but there’s a note which seems to exempt foreign citizens. If this is correct, it would be nice if Thailand could consider doing something similar.
According to the table as of now in SE Asia the tax systems of Vietnam, Philippines and Myanmar differ from Singapore, Hong Kong, Malaysia, and Thailand on these 3 parameters.
https://en.wikipedia.org/wiki/International_taxation