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MASAYOSHI SON. SoftBank Group Chairman and CEO Masayoshi Son speaks on a stage during his presentation at SoftBank World 2026 in Tokyo, Japan, July 14, 2026.

Kim Kyung-Hoon/Reuters

The Basel-based Bank for International Settlements doesn't doubt the scale of the AI buildout — but it frets about the hangover when the spending crests

Although some deem it blasphemous to suggest the AI boom is another bubble, the world’s central banking forum and watchdog has warned against getting swept up in the frenzy, just as investors appear increasingly reluctant to second-guess it.