I feel like your analysis is correct and it’s overvalued but employees and insiders have already been selling shares (eg on platforms like Forge) for around the $130-135 IPO price. So there are buyers, question is if there is enough to consume the liquidity of a $75B IPO.
They won't, SpaceX will weigh less then 1% in most indexes, since they're mostly float adjusted, only NASDAQ will overweight them, but FTSE/MSCI/CRSP/SP will not.
It's still quite some money but it won't crush the market by itself.
