The main reason is that Bitcoin is still not accepted or legalized as an alternative means of payment. Some countries still prohibit Bitcoin, some do not have issues with owning Bitcoin, but do not allow its use as a means of payment.
Well, we have the same problem. Here, Bitcoin is also illegal to use as a payment tool. We only can use the Bitcoin as the digital asset (investment). As long as there is no change in this regulation, there is no chance to adopt Bitcoin for our business transactions. If we force to use Bitcoin as payment purpose, we will get in trouble. We possibly go to the jail, or we are ordered to pay for the fine. This also ruins the popularity of Bitcoin if we break the regulation.
If countries legalize the use of Bitcoin for transactions, I am sure that the number of people choosing to use Bitcoin over fiat for their businesses will increase, especially those who are constrained by distance and currency differences.
Exactly. If it happens, there will be massive adoption to use Bitcoin for payment purposes. I think this may happen in the future since more countries become more friendly with Bitcoin. We just need to be patient for now. Just
followobey the regulation and wait for the change on the policy of our countries! This is the best way to do nowadays.