desjardins
Superstar
I can answer this question because I get to see it live (I live right outside of the apple campus in Santa Clara county). My current neighborhood is nothing but FOB Indians and their families. A lot of them were brought here on these visas. The tech companies are essentially trying to get skills at a discount. They also think it's easier for these workers to integrate into the company's "culture" (a lot of Indians work at these companies already).
Nepotism is real. Companies love hiring developers through referral programs and those are almost exclusively asian and white employees referring their friends
Sites like Blind are full of asians helping each other get referrals. the family angle on this is bad since most of these indians basically train their kids from birth to follow in their footsteps but it's not as bad as straight up importing 500k IT workers