Maybe to counter some of the apparently widely expected doom and gloom:
- bubbles are notoriously unpredictable and generally don't happen when they are loudly and widely proclaimed to happen any minute now.
- large scale infrastructure spending tends to be really good for economies. These three companies are creating lots of jobs that are mostly related to construction, energy infrastructure, hardware spending, etc. That's a lot of money flowing to suppliers and regions where that spending happens.
- While overly pessimistic sentiments about AI and space companies are widespread they aren't much more rational than the overly optimistic ones. The realist scenario could actually be that, AI and especially Agentic AI is already quite useful and the total addressable market for that is obviously larger than it is today. The question is how large. Likewise, dropping the cost of launching stuff into orbit by one or two orders of magnitude, should create a much larger market for launching stuff there. Including possibly some AI relevant compute.
The valuations of these companies are probably on the high side and I'd expect post IPO share values to drop quite a bit and would not personally consider buying anything until after that happens. But that won't necessarily trigger a stock market crisis or a collapse of these well financed companies. All the spending these companies are doing is very real and the profits of their suppliers are going to be equally real. So some of those share value losses might be offset by gains for other stocks and economic growth. The stock market and economy aren't zero sum games.
However, there are worrying macroeconomic trends happening at the same time (Iran conflict, Ukraine war) that are disrupting global markets already. But you could argue that dumping tens or hundreds of billions into e.g. energy infrastructure and data centers isn't the worst way to counter those for a country like the US. The big picture might actually be pretty positive. Especially if we can dodge global economic misery via a prolonged Gulf conflict that at this point seems to serve no point whatsoever for anyone except perhaps Israel.