There are already many people in India using bitcoin for online gambling.
Playing with Rupee's on sites like bet365 happens, but that is up and down because the payment processors have to use Indian banks.
With bitcoin being so popular, the amount of bitcoin gambling sites available is only going to increase.
It is banned in the country and people who are using it are against the law of the country. Cyber cell will identified it and then unnecessary they would have not earned from the gambling that much they would have to pay penalty and may even be sentenced to jail.