Nvidia, a major beneficiary of the AI boom, is under scrutiny as investors question the sustainability of its growth. Despite reporting record revenues of $57 billion and profits of $31.9 billion, Nvidia's stock experienced volatility, rising 5% post-earnings before declining within 18 hours. Concerns have been raised about Nvidia's $33.4 billion in unpaid customer bills and a significant inventory of unsold chips, suggesting potential discrepancies in reported demand. Prominent investors like Michael Burry and Peter Thiel have expressed skepticism, with Burry highlighting "suspicious revenue recognition" and Thiel reportedly selling all his Nvidia shares. Burry has also placed put options betting on a significant stock decline. Nvidia's cash conversion rate of 75% compared to peers like TSMC and AMD, which convert over 95% of profits to cash, further fuels doubts about its financial health. The situation is compounded by AI-linked speculation affecting crypto markets, with Bitcoin dropping nearly 30% since October. As Nvidia prepares to release its fourth-quarter results in February 2026, the company's performance could determine the future trajectory of the AI sector and broader market stability.