alt Hacker NewsOpenAI did confidentially file their S-1, which costs a ton of money to put together for the bankers and regulators to review. They did test the market and it looks like either the banks or people directly around Altman told him not to move forward. That doesn't mean Zitron was wrong about OpenAI IPOing. They took steps in that direction and then decided not to move forward. That's not his fault.
As far as the bubble bursting soon, we are starting to see some pretty concerning signals. The South Korean stock market triggered trading circuit breakers twice earlier this week to stop a runaway selloff in the tech sector. For reference, circuit breakers have only been triggered in the Korean market 10 times in history, and only 5 times ever in the US markets.
https://finance.yahoo.com/markets/world-indices/articles/kos...
FWIW I think there's a "Y2K never happened" future here, where the bubble never bursts (in the sense of some insane market valuation proving to be lunatic) but everyone does what they can to make sure it doesn't burst on them, and they pull back and the bubble just deflates.
Take for example the action on SPACs that made the "SPAC everything" era end.