The original claim was "Their debt load and infrastructure costs compared to their relatively meager earnings..." which is just obviously not applicable to Google and NVIDIA, which both crank out more than $100 billion per year in profits. They can literally take on almost a trillion dollars each in debt to finance data centers and still be in reasonably good financial shape.
OpenAI and Anthropic are not very profitable (yet!), but rely mostly on equity financing, not debt. So no debt load issue there either.
Google search only dies if AI wins, in which case there's no shortage of demand for tokens. NVIDIA's revenue just doubled year-over-year; even if token demand cools off and they slow to say 25% growth, they'll be fine.
OpenAI and Anthropic not making money would be sad for their shareholders, but that's sort of a different topic from whether the "debt load" you originally cited will be any kind of a systemic problem (it won't).
OpenAI and Anthropic are not very profitable (yet!), but rely mostly on equity financing, not debt. So no debt load issue there either.