They MUST. It doesn't matter if it looks fragile or how much money it is.
LLMs risk most of those companies business, they can't afford to not be ahead. If they aren't ahead, there's a risk that the entire US's economy would be in a terrible shape.
American Big Tech companies that make plenty of INTERNATIONAL revenue from Ads (Meta, Google), can quickly become a shell of its former self.
How? Countries and economic blocks could quickly substitute their American products counterparts if they have nothing to offer and could roll out their own.
The US's economy has become very dependant on FAANG cashflow, it's what gets other parts of the economy moving.
No wonder they had a dinner with Trump. If this fades away, US will look very weak and with a terrible economic outlook.