e.g. What if Mt Gox v2 happens and some random CEO decides f it, I'm keeping my private keys. Not their keys not their coins.
1. This will only apply if the exchange is registered in Wyoming.
2. If it's a public company it will have to reimburse all investors in court.
3. Even if it's a private company, you can't just keep the private keys to yourself like that because you have to pay all the secured creditors in the event of a bankruptcy.