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.
https://in.reuters.com/article/reliance-telecoms-jio/from-bi...
https://cis-india.org/internet-governance/blog/reliance-jio-...
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.
Further all 3 major firms are in massive debt, and after the SC interpretation of how they have to pay their dues, they are pretty much dead firms unless they get money.
You can already see them creating new packages to target users who have more disposable income.
I'd say make hay while the sun shines. The structure of a market dictates the strategies and tactics which work. With 3 players collusion is the norm, not competition.