Very likely, this is because in the view of Islam, Bitcoin and Cryptocurrency in the view of Islamic law it is permissible and not prohibited. of course this will be the reason some Muslim countries will easily be able to accept Bitcoin and Cryptocurrency.
Many Muslim countries do not think of the sharia laws because they are already doing banking system which is totally against sharia law. They know the importance of cryptocurrency, but still there is no single Islamic country that accepted cryptocurrency but I am sure they will change their mind in the future and will allow their people to invest and trade in cryptocurrency.