1. Money laundering i.e. How can Chinese government officials embezzle tax money and keep it? Buy real estate overseas and have your family live in them.
2. Tax evasion. Buy real estate overseas and have your family live in them.
The education angle makes sense, but imo it's not the main reason.
Anyone smart, Chinese, and with resources is looking for a way to not be subject to Chinese legal/government jurisdiction, and if you were in China, you'd be doing the same.
You missed the point that the people fleeing is already stealing tax and are likely the bad parts of the system themselves. They are fleeing from others like them and the justice, to begin with. If the system will collapse or not, i doubt that cross their mind.
As in, money laundering requires that the source of money have an illicit origin - not merely the observation thats its being moved around - but if the origin is successfully completely unknown, or if the origin is determined illicit by the Chinese government, then neither of those really satisfy the criteria for vilifying the current recipient
Anyone who wants to know where this magic foreign money is coming from. Personally, I'm not judging anyone. At the same time I don't like living in ignorance.
Using that info to use public resources on curbing money flows is something I would be against, given that its a fools errand