That's limited to extended family/clan groups within 1-2 castes when it comes to business domination (mostly Patels in the US). The scope of it is also fairly limited which is why you only really see these people owning hotel and fast food franchises. There's also the preference for hiring of Indians by hiring managers of the same ethnicity, this is more from cultural compatibility and goes away within one generation of being raised locally. I would expect the current prevalence in certain sectors to reduce over time as immigration decreases and the next generations become more divorced from their origins along similar lines to how the Japanese-American community faded from existence in most of America.