The problem is not having so much money available.
Such a big expense only makes sense for a company where spending that amount would bring hundreds of millions of $ of additional revenue.
I doubt that any of the companies that have already spent such amounts have recovered even a small part of their expenses. It is more likely that they bet on future revenues, but it remains to be seen who will succeed to achieve that.
Kinda, companies of that scale regularly spend more than that on (often) random R&D.
Sure if there is a plausible ROI, they’d have no issues dropping that much money (actually far more). Revenues for fortune 500’s are going to be in the 10’s of billions anyway, and it wouldn’t be hard to make an argument that random AI project could increase that by a couple percent or decrease costs a couple percent, which would more than provide that ROI.
Their biggest issue is usually having anyone in leadership that has a clue enough to even propose something plausible, let alone get a team together to give it a plausible go.
Such a big expense only makes sense for a company where spending that amount would bring hundreds of millions of $ of additional revenue.
I doubt that any of the companies that have already spent such amounts have recovered even a small part of their expenses. It is more likely that they bet on future revenues, but it remains to be seen who will succeed to achieve that.