Foreign companies majorly in Bangalore

I don't intend to create any sort of hate here. I want to know from knowledgeable people that why are foreign companies majorly in Bangalore rather than being divided equally across all cities of India. If this was the case, a lot of people especially from North India will not need to leave their homes and come to Bangalore. They can get a decent job in their own city and Bangalore will not be overcrowded as it is today. It'll be a win-win situation. Also pls tell me what's the governments role in this?