He has plenty of shell companies outside India to increase his stock prices. All his stocks are highly inflated by the debt taken from gov and pvt banks. He holds many ports, airports contracts, media houses in india, so if he goes down he can take many innocent lives together( though it wont matter him much as compare to regular stock market joe and business)

In short, running scam with gov involved( no proof, but it is very much clear how his projects are getting approvals)