They didn't invest 94B$
But yes the stock could go down much further and I hope they are willing to show the losses if they can show this as gains today.
Imagine the next call being about how their 95$B went to sub 30B$..
Will that be a negative line item. I don't see the point in disclosing this stake as earnings.
But I do get that accounting was made as a tool for companies to show off.
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.
correction "modern business accounting".
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.