You proved nothing, only made an accusation. Now prove it or shut up.
Microsoft (and hell, all of Silicon Valley) are the biggest boosters of H1-B visas.
Profit margins in the software industry are around 50%-60%. Conventional consumer goods, like Coca-Cola, may be 10%; bricks-and mortar groceries are 1%.
They don't need H1-Bs to make a profit.
Name an overseas software company that is eating Silicon Valley's lunch, by using foreign labor, to which Silicon Valley had to respond, by lowering their labor costs. *crickets*.
And software is among the LEAST regulated industries there is; compared to (say) insurance, or health care, or construction.
Read Microsoft's EULA some time and note that the boilerplate language is that the limit for damages, even if Microsoft new about the potential flaws in the product, is $5 / seat. Dirt cheap, even if tripled for class action.
And the threat to move software engineering to India is laughable, as India's culture of bribery, to say nothing of the ineffectual electric infrastructure, would never support the server farms necessary.