SoftBank Group Chief Executive Masayoshi Son's "all in" bet on OpenAI appears to be paying dividends after the ChatGPT-maker's valuation soared this year, producing a surge in quarterly profit for the Japanese technology investor. The results mean more money for SoftBank to employ in its artificial intelligence-related investment spree even as concerns mount of an "AI bubble" in which valuations overestimate the profits the technologies can generate.