Famous Silicon Valley Venture Capitalist Warns: If Open-Source AI Is Banned, Cost Pressure Could Cause Entire US Stock Market to Collapse

Renowned venture capitalist Chamath Palihapitiya has issued a strong warning, stating that if the U.S. government bans companies from using open-source AI, it would severely damage corporate profitability through a cost transmission mechanism, ultimately bringing down the entire stock market. This statement comes as the debate in Washington over open-source AI regulation is intensifying rapidly.

Palihapitiya remarked bluntly on last weekend's "All-In" podcast: "If the U.S. government steps in, the U.S. stock market will crash, there’s no doubt about it."

He cited Coca-Cola as an example, noting that if companies are forced to use closed-source AI, their AI usage costs would be 50 to 100 times higher than the current best alternatives. This cost pressure would ultimately compel the market to revalue the relevant companies. Meanwhile, his co-host, former AI and crypto executive David Sacks, called out Anthropic by name, criticizing its lobbying of the government to restrict competitors as "disgusting."

These remarks come in the context of a domestic startup, Moonshot AI, releasing the open-source model Kimi K3, which outperformed Anthropic's Fable 5 and OpenAI's GPT-5.6 Sol in a blind test of frontend programming tasks. This has heightened U.S. vigilance about Chinese AI competition and prompted some to call for restrictions on open-source models.

Cost Transmission Logic: Why Banning Open Source Would Devastate U.S. Stocks

Palihapitiya's core argument centers on a distortion of cost structures.

He pointed out that AI has become a crucial input for corporate operations. Once the government forces companies to use only closed-source commercial models, the associated costs will be orders of magnitude higher than open-source alternatives.

"You are forced to bear costs that are neither reasonable nor market-driven," he said, "while your competitors outside the United States are not bound by these constraints, which will directly undermine the competitiveness of American companies."

Using Coca-Cola as an example, he described this scenario: as AI costs rise sharply and corporate profit margins get squeezed, the market will be forced to lower their valuation expectations for such companies. This logic applies to almost all traditional businesses currently advancing AI transformation, meaning the potential market impact is extremely widespread.

Targeting Anthropic: Regulatory Arbitrage or Market Competition

Palihapitiya further directed his criticism at AI labs themselves. He warned that if the government truly bans open-source AI, the valuations of Anthropic and OpenAI would instead "collapse," because their current revenues are not the result of real market competition, but rely on artificial regulatory barriers for support.

"All this revenue is artificially propped up, not driven by market demand under competitive pressure, but by artificial restraints gained through regulatory arbitrage," he said, "but such restraints only work in one market."

David Sacks’ comments were even sharper.

He pointed out that Anthropic, as "one of the most successful tech companies ever," has gone to the government seeking protection—not just against Chinese competitors but also U.S.-based competitors. "Frankly, it’s disgusting," he said.

Sacks also warned that declaring that U.S. companies may not use open-source assets from the public domain would "plunge a dagger into the heart of the entire U.S. open-source ecosystem."

Joint Industry Response: Tech Giants Rally Behind Open Source

As regulatory pressure mounts, the tech industry has begun to push back collectively.

According to CNBC, Nvidia, Microsoft, Meta, Palantir, and more than 20 other firms jointly sent a letter last Friday urging policymakers to avoid imposing "premature restrictions" on open-source foundation models, warning that such limitations would "stifle competition or drive innovation offshore."

Nvidia CEO Jensen Huang also commented on social media, stating that open-source models help strengthen security and cyber defense, accelerate innovation diffusion, and protect technological sovereignty.

Notably, Anthropic did not sign this joint letter.

Divisions Within the White House: Sanctions Threats and Commitments to Protection Coexist

The stance within Washington is not unified.

White House science chief Michael Kratsios publicly accused Moonshot AI last Wednesday of "distilling" technology from Anthropic’s Fable model, and claimed the company obtained restricted Nvidia GB300 chips via Thai servers to train their model. Treasury Secretary Scott Bessent also posted on social media, make it clear that when distillation by Chinese companies "crosses the line into intellectual property theft," sanctions and entity listing would be among the options.

However, on the very same weekend, the open-source camp seemed to receive a positive signal. Luther Lowe, head of public policy at Y Combinator, posted that he spoke with Secretary of Commerce Howard Lutnick at Saturday’s White House Correspondents' Dinner, and Lutnick told him directly: "This White House will protect open-source AI."

This statement suggests that, although hardline voices on Chinese AI competition are persistent, there are still clear internal differences within the executive branch regarding a comprehensive open-source ban, and the final policy direction has yet to be decided.