It's not even an American bubble. Some sources show that the iPhine market share in the US is only slightly above 50%.
https://gs.statcounter.com/os-market-share/mobile/north-amer...
[0]: https://deviceatlas.com/blog/mobile-os-popularity-by-us-stat...
[0]: https://deviceatlas.com/blog/mobile-os-popularity-by-us-stat...