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Comment from mcint on HN:
From an external perspective, he can be viewed as a magnate who led a group comparable to Disney in terms of breadth, scale, and market share across multiple industries in India. His leadership was particularly notable during the massive telecom rollout in the country.
He oversaw the largest wholly owned and most advanced subsea fiber network, responsible for carrying around 30% of the world’s internet routes (source: Brave.com’s Llama, via Tata). While the "30% of the world’s internet routes" signifies a burden on BGP for other operators, it also highlights the distributed control of global networks.
As an investor, he was the first Indian to acquire a stake in Xiaomi, among many other startup investments. Some Xiaomi executives even noted that they sought Ratan Tata’s advice on global expansion.
As a philanthropist, his contributions are even more impactful. He has supported the hacker community, donated to US college campuses in tech, biotech, and genetics, and funded scholarships to foster talented, driven individuals who come to learn in the US.