I don't think Jio's game is to squeeze out revenue from the cheap data users. They've openly admitted to using Deep-packet Inspection techniques and I believe data harvesting is where the main long-term game looks to be for them.
If you're concerned about your privacy, it's usually known in India in the tech circles to stay away from Jio related products.
What can any packet inspection do over https, since that's where the majority of the important traffic is,not to mention that a lot of apps use certificate pinning, so even MITM can't help analyse the packets. And all this is before eSNI becomes mainstream.