Indians deep-down often aren't comfortable in the West given the subtle racism and general social-rejection (last year's anti-Indian hate on X remains fresh in memory).
BLR has of late become a sort of "refuge" of tech retunees (with horrible third-world government and infrastructure, though). And it shows - the Matryoshka Embeddings being used in Gemini on-device / embedded models, came out of Deepmind BLR.
For sure, there’s no place like home, and people have families and networks they can’t take with them. Still, getting that Western passport is a draw, and there’s always Abu Dhabi if you want quite close to home and a decent biryani, but also want world-class infrastructure and high (although not quite US) wages