[Thorentis]

Companies more likely to want to save money on labor costs (employing many h1bs) are also likely to want to save money on Tooling costs, by using safe options like MSFT stuff, rather than finding better tools.

Also yes, due to availability and various other reasons, H1bs, particularly from India, seem more likely to use a MSFT stack.

[array_key_first]

MSFT tools aren't even cheap - they're very expensive. Many FOSS tools are just better and cheaper. End of the day, even RHEL is cheaper.