Concerns over AI (AI) capital expenditure are rising within the US tech sector as companies like Meta, Alphabet, Oracle, Amazon, and Microsoft increase borrowing to fund expansive AI infrastructure. Investor enthusiasm is cooling due to doubts about profitability and returns, with analysts noting AI infrastructure costs and revenue mismatches and short lifespan of AI chips. Despite stock declines and warnings from Rothschild & Co Redburn, firms continue investments and partnerships within an interconnected AI ecosystem called "the Blob," supported by the US government and involving major players like Nvidia and OpenAI.