We had a zoom meeting with my elderly mother's investment adviser recently and expressed our concern about the AI bubble. He of course said he didn't think it was a bubble; his main argument was "these CEOs are smart people and they're legally obligated to preserve the financial health of their companies so they wouldn't be going in for anything that had the potential to be a bubble". Conveniently ignoring all the other bubbles in history when the CEOs were "smart people".