Byju Raveendran, the founder of edtech group Byju’s, admits that his startup, once valued at $22 billion, is now effectively worth 'zero'.The aggressive acquisition of startups to expand into new markets proved fatal for Byju’s when financing dried up in 2022.Many investors urged for aggressive expansion, but backed out after global markets tumbled due to Russia’s invasion of Ukraine.Departure of key backers and governance issues led Byju’s into insolvency proceedings, making it impossible to raise additional funds.