For those not aware, Jio itself came into being via a scam. (That the comment I replied to is alluding to). The TL;DR is Reliance acquired a company that had only managed to win an Internet Service Provider license auction (that too in a dubious manner [1], [2])
Then Reliance 'convinced' the government to let them convert the license [3] to allow them to provide voice services as well, for a paltry fee (the amount they paid was set in 2001 and did not account for inflation over 12 years - which is pretty significant in India). Thus Jio was able to become a full blown 4G cellular provider at a fraction of the cost of competitors like Vodafone, Airtel etc.
[1] https://scroll.in/article/802277/why-its-crucial-for-apex-co...
[2] https://economictimes.indiatimes.com/industry/telecom/dot-re...
[3] https://scroll.in/article/802282/how-many-committees-does-it...