Can someone explain why even people who aren't able land aby decent position here, end up in really good profiles in USA?

I don't know how many years of experience you have.

But here is a piece of advise from a long time.

More than skills what matters more is luck and timing. Remember this you will have a more satisfying career.

If you see someone succeeding without skill, just tell yourself you will also have a time when luck will work out. And when you do, remember thee will be someone complaining that you got promoted or migrated without enough skills. Immaterial of how much hard work you put in.

The ms route!

Yeah even I have seen that happen I have seen peers from my college land job at faang ( Amazon especially ) after an ms where as in India they weren't able to get job anywhere apart from witch companies

Luck, timing, good soft skills. Also, they might not perform in the hellhole that Indian orgs are but thrive with autonomy and control that a lot of American orgs give.