Yes, he
is the game changer when it comes to bringing fast and cheap internet in India (along with unlimited calls, data, 'national roaming' etc.). Unlike some countries like US, national roaming wasn't really free in India until Jio happened. So much that it forced
every other telecom company in India to have similar plans (at least close to that) even if that meant huge downfall in their profit. Such is the power of Mukesh Ambani.
But, if someone is thinking the reason behind it is his philanthropy or something, forget about it. He's the biggest businessman in India, and just wants to capture all the market and all of its 'data'. Ambani wants his company to become India's Google.
That being said, thanks to him, literally (almost) everyone in India is on the internet these days.