I wrote about this in another comment, but I've typically found that public US companies hiring a majority of Indian/Indian-origin staff seem to perform (in market cap terms) on par with companies have just 10% of their total employee headcount.
Even if true it doesn't prove anything because the arrow of causation could go either way. These businesses could be already worse from a financial or working environment perspective, and thus unable to hire from a pool of workers who have more options.
