The global economy is nearly 80 trillion USD per year. Payments using any type of cryptocurrency as a medium of payment is a tiny fraction of this total.
What are some of the reasons preventing cryptocurrency from being more successful as a medium of payment?
first of all cryptocurrencies are not enough fast for payments. it takes time for approvement. especially for bitcoin. second volatility is very high so there is a risk for both buyers and sellers. third it is still not easy to cash out from cryptocurrencies because of some regulations.