And now, my friend, you are actually making my points for me.
India doesn't have a subscription model for cricket viewership because the viewers are far too poor. Even the Indian middle class is far, far too poor to do what I do and pay well over $200 per month to watch Pay-TV.
Secondly, I can find no evidence of any IPL broadcast in the UK ever having been watched on Sky TV by enough viewers to register any ratings whatsoever.
But what I do know is that free-to-air TV ratings for the IPL on ITV4 in the UK were so terrible -and in decline - that, like every Australian TV channel, ITV gave up on broadcasting it and let Sky show it (to nobody).
Source:
https://www.bizasialive.com/overnights-ipl-uk-ratings-lower-than-last-year/
But you have gone way off track in even mentioning the IPL. The thread has nothing to do with revenue from private leagues.
This thread is about what proportion of
international cricket revenue is attributable to India.
And because ground revenue in India is basically zero, the BCCI's far-fetched claims to generate 80% of revenue conveniently overlook ground revenue. They overlook long-term TV deals like the ECB and Cricket Australia have.
It's like saying that Juventus earns more than Manchester United on TV revenue. Yes it does. But Man Utd makes more than $7 million in ground revenue from every game, while Juventus makes around $2 million. And with 25 home games each season, that's a $125 million windfall.
Lastly, your final point about British viewers for a West Indies v New Zealand series is basically my whole point.
The current India-driven system of bilateralism sees the West Indies make most of their TV sales when India and England tour.
But if the rights are pooled, the successful purchaser HAS to buy West Indies v South Africa/NZ/SL/Bang/Pak as well.
The rights sell for significantly more, and then the revenue is pooled and shared so that no Board can try to starve out a rival Board in the way that India has with both South Africa and Pakistan recently.