The Bank for International Settlements cautioned that Big Tech's aggressive AI spending could culminate in a damaging investment bust, potentially rattling financial markets and harming the global economy. The Basel-based institution highlighted risks from the five largest hyperscalers planning over $1tn in capital expenditure through 2026.

Historical patterns suggest trouble ahead, according to the BIS annual report. Previous booms in canals, railways, and dotcom stocks all attracted excessive capital that eventual reversals couldn't sustain, each triggering economy-wide recessions. The warning comes as tech firms flood credit markets with hundreds of billions in AI funding.

SpaceX's $86bn IPO and subsequent $25bn bond offering exemplify roaring investor appetite, though Allianz's investment chief recently declared markets had entered bubble territory. Stock volatility has intensified alongside Federal Reserve rate hike expectations, creating turbulence for AI-linked equities.

Household wealth exposure to equities now exceeds historical levels, amplifying potential fallout. Combined with persistent inflation from the US-Iran conflict disrupting Strait of Hormuz energy shipments, financial vulnerabilities are mounting. The BIS warned these interconnected risks could severely test market resilience if AI returns disappoint.