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.

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.