WTF happened to Byju? The article states "Prosus, an early backer of Byju’s, wrote off its 9.6% stake in the venture after valuing it at $493 million at the end

WTF happened to Byju? The article states "Prosus, an early backer of Byju’s, wrote off its 9.6% stake in the venture after valuing it at $493 million at the end of March.", and there is a linked article with more details at https://archive.ph/BVjYI https://archive.ph/BVjYI. If you go from $493 million to zero in less than three months, with no big catastrophic event in the interim, it was always BS to begin with.