IMHO the investors are betting on a winner-takes-it-all market and that some magic AGI will be coming out of OpenAI or Anthropic.
The questions are:
How much money can they make by integrating advertising and/or selling user profiles?
What is the model competition going to be?
What is the future AI hardware going to be - TPUs, ASICs?
Will more people have powerful laptops/desktops to run a mid-sized models locally and be happy with it?
The internet didn't stop after the dotcom crash and the AI wont stop either should there be a market correction.