OpenAI is closing a $40 billion funding round, known to be one of the largest private tech deals on record. The staggering growth of artificial intelligence (AI) has triggered an unprecedented surge in venture capital, with global AI investments projected to hit “$200 billion” this year. But as money floods into the sector—particularly large language models and foundational AI systems—top investors are beginning to voice concerns about sustainability, profitability, and the eerie parallels to past tech bubbles.