I don't know what his background is, what his family is like, or what it's like to win the app lottery in Vietnam.
I could imagine scenarios where acquiring that kind of money could destroy your personal relationships, and make you a target of unwanted attention from governments, mafias, or weirdos.
This is especially true in a third world country with perhaps a modest level of corruption. Everyone will want a piece of you whether or not you wanted it. Personal safety and the safety of your family all of a sudden become a major concern.
I could imagine scenarios where acquiring that kind of money could destroy your personal relationships, and make you a target of unwanted attention from governments, mafias, or weirdos.