TOKYO, May 12 : SoftBank Group is expected by analysts to report another robust quarterly profit on Wednesday as the technology investor benefits from its growing OpenAI bet, though concerns are increasing over the debt it is taking on to fund it. While SoftBank's "all-in" bet on OpenAI has proven lucrative so far - the ChatGPT-creator's valuation has leapt to $840 billion in its latest funding round in February - analysts say the Japanese company may be approaching the limit of what it can