I don't know about Infosys, but we have a TCS (Tata Consultancy Services) branch here in Uruguay, and it is very common for junior developers to do a few years there, and then quickly realize they've "outgrown" the company and get recruited somewhere else or start their own company - and those "child" companies recruit the cream of the remaining crop, leaving the worse/less motivated employees at the mother company.

TCS does try to keep some of the better ones around, but from the outside I cannot know how succesful they are.