Alphabet's 12.6% plunge leads AI moat test as Big Tech loses $900 billion

The selloff arrives as Wall Street's long-standing castle-and-moat vocabulary — Jamie Dimon's 'fortress balance sheet' and Warren Buffett's 'moat' — is being stress-tested by AI economics. The irony spooking investors is that AI is eating into the businesses that throw off cash, while that cash is being redirected into AI build-outs. Apollo's Torsten Slok argued in an Oct. 24 note that AI 'has delivered zero financial payoff to corporate America outside of tech,' with revenue per worker and profit margins rising for the Magnificent Seven and flat for the rest of the S&P 500. Judging by Slok's third moat test — the ability to charge more without losing customers — the companies selling AI don't seem to measure up: OpenAI's new GPT-6.1 Terra model costs up to half as much per token as the version before it, and token prices are down roughly 35% since the end of June, per Ramp. Meanwhile, the gothic metaphor has deep roots: Horace Walpole's 1764 The Castle of Otranto, Karl Marx's 1867 image of capital as a vampire, and Bram Stoker's 1897 Dracula all frame crumbling aristocratic power — a lens now applied to software companies with distressed debt.