A Japanese billionaire said on Twitter that he had lost 4.4 billion yen (US$41.4 million) by trading stocks amid volatile swings triggered by the pandemic.In a tweet titled “Deep Regrets”, Yusaku Maezawa, founder and former chief executive of online fashion retailer Zozo Inc, said he lost money through day trading – a practice he has failed to master. He expressed regret over the sum he had lost and vowed to recover it through his business.“I was blinded by the virus-driven market swings and…