Cryptocurrency is complicated. In order to use Bitcoins, you would need to have a PC or a phone, an Internet access, and certain skills that most of the world's population does not possess. Creating a secure wallet, buying a crypto, executing a transaction and then tracking it — all this doesn't sound so familiar and simple!
And who has ever paid in Bitcoin for small purchases? Unless, for the sake of interest, you can buy a cup of coffee for NEM (Bitcoin, unlike NEM, can take several hours for a transaction confirmation). The cryptocurrency is not used for daily purchases because it is slow, convenient, and not user-friendly.
This is precisely what Telegram Open Network is trying to solve. The simplification and the right user interface is the key to more loyal users. Durov's team can pull this off.