They don't know enough to complain. That's a major part of the problem. Signing up is compelled by misrepresentation of the entire system, the whole way through.

When a lot of the economy depends on volatile markets, there are negative externalities. In other words, it doesn't just affect the people who are using the market to gamble.

The people engaging in risky behavior aren't complaining. They're selling (or trying to).

China has significant capital controls, they don't have many other options.