Online retail continues to elude India’s richest man. The SheiniSheinFounded in China in 2008 and headquartered in Singapore, Shein is a fast fashion brand that grew rapidly through exposure on social media.READ MORE India app, launched by Mukesh Ambani’s Reliance Retail in partnership with the Chinese fast-fashion giant, has struggled to gain traction in a market where Amazon and Walmart have been fighting neck-to-neck for nearly a decade. Downloads for Shein India nosedived from 50,000 a day s...