They should use the 4 billion to buy a crypto portfilio of coins with actual value. Litecoin and Ethereum would be a good start.
Imagine raising your capital with the stock of another public company, then your proceed to continuously devalue said public company by dumping your shares in order to gain liquid capital to build your product.
Edit: The most interesting thing to come out of the cryptocurrency is that the lines between equity and currency have become very blurred
I work on this
I'll try to check out the mobile wallet sometime.
No.