the existence of the bitcoin makes things unpredictable, originally I assume same bitcoin with paypal or payment processor. that makes me amazed is the speed of the transaction, then it is accepted throughout the world.
To be honest, bitcoin is not yet accepted throughout the world because there is still a few countries that doesn't accept bitcoin and some of them banned bitcoin from their country because of security and trust issues about bitcoin. The transaction of bitcoin as of now, is being slow because of the unsustainable network that caused by the big volume of users. And somehow you need to pay higher fees to make your transaction faster but it is still better than paypal because it doesn't support chargeback.
I agree with you, bitcoin is not yet accepted by some other countries, maybe we can see that every country there were users of bitcoin yet not yet accepted by their country and some banned it. But this has nothing to do with transaction fee or transaction speed. If you compare bitcoin with paypal, Bitcoin is far far better as compared to paypal in terms of fee and speed.