The physical hosting while not trivial is not a big challenge. They need to find a reliable hosting provider in India and there are many. Where it gets really

The physical hosting while not trivial is not a big challenge. They need to find a reliable hosting provider in India and there are many. Where it gets really hairy is routing. Example - handling payments of Indian international travellers; or card details entered on websites that are hosted outside of India. I worked on a similar project but 1/10th of scale and even then it was extremely tricky to cover all the edge cases.