Its a very good read. The family is lauded as heroic for their meteoric rise. The amount of cheating and bribing that they did to get there doesn't get that much attention. And to be clear, in a system where the laws are selectively applied, that might be the only path to business success, and they were able to exploit it to the max.
Wikipedia shows it was banned from being published in india. Interestingly, the citations are pointing to a 404 page. From bit of googling, I can find post from wire [0].
Btw, you can find listing of many banned items on amazon. That doesn't mean they are not banned or illegal. Plus, it seems that book is from international sources because 30k is a huge amount in India. That's more than the average salary here monthly.