Currently In India no one able to Understand how Crypto and Bitcoin works which leadings to So many related scams.
Like Selling fake coins, promising to provide bitcoin for cheap, etc.
Other factor is money laundering and Non stability of price changes in crypto as it's not regulated by any Government.
They simply can't understand it yet and hence declaring it illegal.
That's what they want us to believe
Now on topic or the main thingy
They can't find a way to scam in this as price is non stable
They will later come up with their own Coin which will be used by Netas for more scams :/