But then, why don't the high-caste people who are not under the heel of authority start companies?

It doesn't work if the programmers that get hired simply try to do what's ordered of them. which is true for a lot of Indians. You need programmers that actually care about the program they are addressing and who want to write beautiful code.

Indian culture doesn't easily allow bringing programmers in contact with interesting programming challenges and then getting out of the way while making certain that there nothing to distract the programmers from doing their work like having nothing to eat.