This. Anecdotally one Indian Institute of Technology (IIT) senior Professor told me that normally the best achievers of their undergraduate students go to US for work or further studies after graduation, the middle achievers work in India and the bottom achievers mostly continue their study at IIT with India govt's sponsorship. According to him even the bottom achievers are actually still good students since they graduated from IIT.
Since there are currently 23 IITs, the numbers that go to US (and SV) every year can be very significant. The long term effect of this phenomenon can be observed from the increasing number of US (and SV) tech companies CEOs are from India education background.
Since there are currently 23 IITs, the numbers that go to US (and SV) every year can be very significant. The long term effect of this phenomenon can be observed from the increasing number of US (and SV) tech companies CEOs are from India education background.