SoftBank Group Corp. Chairman and CEO Masayoshi Son is being forced to reduce his risk appetite in his investments in tech firms and unicorns that have driven the conglomerate's expansion in recent years as the coronavirus pandemic has pummeled its portfolio.The company's $100 billion Vision Fund has been losing traction as the global spread of COVID-19 severely hit the business activities of the companies SoftBank Group has invested in, including Uber Technologies Inc. and OYO Hotels and Homes.SoftBank, which also runs telecommunication and chip design businesses, has poured huge amounts d…READ FULL ARTICLE