Jio Platforms’ IPO is putting the Ambani family’s relationship with India’s retail investors on a new footing, almost five decades after Dhirubhai Ambani took Reliance Textile Industries public in 1977. The Rs 30,213-crore issue was fully subscribed within two hours of opening, but Jio’s long-term success as a listed company will depend on whether it can turn its massive telecom and digital reach into sustained earnings growth and investor returns.