The complaint isn't about the investors losing their money on a bad investment, it's about their money being stolen through fraud.
1. Use investor's money to make a valuable asset for company A 2. Sell asset for small change to company B you own personally 3. Liquidate the original company A 4. Profit
This is a common fraud. It's not a very difficult idea for people with weak ethical values to come up with, it's quite difficult to prove and even even if you do and get your asset back, it's even harder to successfully prosecute the fraudster.