Does it matter if you don't support your parents' green card when you settle abroad?

It doesn't matter. Not only can the elderly in China not follow their children who have already got green cards, but they will also face the situation of loneliness and no one to support them. Living abroad without supporting parents has no effect on the green card. Supporting parents is the duty and responsibility of children. No matter where you go or how big your official position is, you have the obligation to support your parents. They can't avoid their adoptive parents just because they are immigrants, and their parents are grateful.