Some companies invested in the young internet. That created "The Internet Bubble". We still had the internet after that bubble burst.
Some companies are investing trillions in LLM AIs. It is probably a bubble. But we will still have LLM AIs if that bubble bursts.
Some companies are investing billions in humanoid robots. It may be a bubble. But we will still have humanoid robots if that bubble bursts.
LLMs have already proven themselves to be economically valuable. At a bare minimum, they can help people develop most low-mid level software considerably faster, at a good enough quality.
They also have proven themselves in other white collar knowledge endeavors as well, as valuable tools that augment human economic output. Marketers can make more copy material, any office worker can improve the quality of their email communications, etc. Easy.
What are humanoids doing exactly? What can they do, that actually makes sense and provides positive economic impact over existing alternatives? Not clear to me.