The government did really give Jio a helping hand by allowing the cheap fixed line spectrum from a Reliance-fronting company to be converted to voice, and also not having to provide any legacy 2G support.motorola supports almost all bands atleast my office issued g51 does.
jio has already upgraded its towers for 5g, just need to turn on a switch.
This has really helped Jio in getting more 4G spectrum later on and now being the sole owner of the 700 MHz 5G spectrum which doesn't require much hardware upgrade. That is the reason that in a lot of circles it is just a software upgrade for them.
Meanwhile, the other operators keep drowning in debt. Not long before Ambani becomes the telecom overload.