I guess that's because we get more Indian referrals from a team with more Indians. At least my current team is dominantly Indian because of this reason.

Also, I personally feel there is fundamental difference is how Indians interview the candidates. Indian interviewers usually try to identify the weakness of a candidate (if there is a fullstack opening and the candidate's strength is more on the backend, the interviewer leans more towards frontend to identify the weaknesses of a candidate). Non-Indian interviewers most try to find the strengths of a candidate. When I attend interviews and see a panel with Indian names, I know that those slots suck.

Of course exceptions apply for everything..just my observation being Indian working in Indian teams..