Accounting goes back thousands of years. It was not made as a tool to show off. Lesson is more that tools can be abused for other purposes than intended.

They don't have to be willing because hiding the losses would be a crime. And it still doesn't matter b/c anyone with a calculator can tell you exactly what the value of their position is on any given day. The $94 billion is 2.4% of Google's market cap, so even if SpaceX goes to zero it will be barely noticeable from the background noise of the stock price movement.