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More and more people are ditching carrier roaming in favor of travel eSIMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
And lower population density. At least in the US, there's a ton of empty space with pretty good coverage. I imagine India has a lot less open space, so more paying customers per tower.
The salaries for people building and operating the infrastructure are probably a bigger component though.