Better reconsider dude because politics is everywhere including your own home.
he might not be moving from US because of political reasons alone ,he would have found that it is more cheap and inexpensive to live in a third world country and being a US citizen have its perks in a third world country i guess. Good luck
But what about the taxes? A citizen of the United States needs to pay tax on his income, regardless of his residency status. So if he is earning some money in the Philippines, then he will be paying taxes to both the Philippine and US governments.