Today's massive AI company valuations are based on market sentiment ("vibes") and debt-fueled speculation, not fundamentals, just like the 1999 internet bubble. The market will likely crash when confidence breaks, long before AI's full potential is realized, wiping out many companies but creating immense wealth for those holding the survivors.

Previously, rising AI CapEx was a universal positive signal for tech stocks. Now, investors are differentiating sharply, punishing companies that can't demonstrate a clear path from their massive AI investments to tangible revenue and earnings growth, creating significant performance dispersion among AI leaders.

Microsoft's public perception can swing from "can do no wrong" to "the worst" within a year, despite its stable underlying business. This demonstrates that market sentiment is increasingly a game of "trading narratives," disconnected from financial reality.

The market is actively rewarding and punishing tech giants based on perceived momentum in the AI model race. An analyst notes Meta's stock appreciated by 10 percentage points after its model update, while Google has been "punished" by investors for views that its Gemini model is slowing down.

The startup landscape now operates under two different sets of rules. Non-AI companies face intense scrutiny on traditional business fundamentals like profitability. In contrast, AI companies exist in a parallel reality of 'irrational exuberance,' where compelling narratives justify sky-high valuations.

Initially, the market crowned OpenAI (via proxies Nvidia/Microsoft) the definitive AI leader. Now, with Google and Anthropic achieving comparable model performance, the market is re-evaluating. This volatility shows investors moving from a "one winner" thesis to a landscape where top AI models are becoming commoditized.

The market no longer rewards companies for just announcing massive AI spending. Each tech giant—Google, Microsoft, Amazon, and Meta—is now judged on its unique AI narrative and its ability to connect CapEx directly to near-term revenue, whether through enterprise adoption, cloud infrastructure, or ad performance.

Microsoft's record-breaking market cap increase signifies a crucial shift in investor sentiment. The market is now rewarding companies that can translate massive AI investments into immediate free cash flow and efficiency, punishing those like Meta with more speculative, long-term roadmaps.

A company can beat earnings and still see its stock fall if its actions (e.g., high CapEx) contradict the prevailing market narrative (e.g., the AI bubble is popping). Price is driven by future expectations, not just present-day results.