"GPT-5 is the first time that it really feels like talking to an expert in any topic, like a PhD-level expert."

Yeah, feels like. Not actually examples of thinking and doing things at that level.

"These systems, as impressive as they are, haven't been able to be really profitable," ... "There is a fear that we need to keep up the hype, or else the bubble might burst, and so it might be that it's mostly marketing."

That's the painful truth. No profit, a lot of hype and a market in a 2008 financial crisis bubble.