I am just a regular unhyphenated American at a FANG, and I've never gotten a job offer when any of my interviewers were Hindustani. Coincidence, maybe? I think this particular nepotism is not exclusively internecine.
Once I worked with a group that was run by a brahmin hindi speaker and a group of Tamils was under her. It was really weird to see them speak English to each other since neither spoke each others' native tongue. She was not very nice to the Tamils and spent most of her time planning for ostentatious Diwali celebrations in the office.
The US has no place for this kind of discrimination. We strive to be (I hope) a meritocracy.
1: https://www.brightworkresearch.com/enterprisesoftwarepolicy/...