The downturn comes a day after a region-wide rally fuelled by an earnings report from AI bellwether Nvidia. HONG KONG: Japanese and South Korean tech stocks plummeted on Friday (Nov 21), with tech investor SoftBank plunging more than 10 per cent as fears over an AI bubble weighed on the market. The selling followed a downbeat session on Wall Street after US jobs data clouded hopes of further interest rate cuts and fears about whether red-hot valuations for artificial intelligence shares are