In grad school I knew of several Singaporeans who had their tuition here in the US convered by the govt with repayment in form of returning to a govt job, which in Singapore is a highly prestigious job.
Grads are a large portion of the Chinese that work in SV.
Many of the Chinese who come to the states and pay for their education out of pocket couldn’t get into a good school back home and are going back after their education finishes. The others are rich, here for the experience, and will still go basic home because of their family expectations and connections.