in my opinion, why is bitcoin never a global currency, because every country already has its own currency, if you want to put bitcoin in it, of course there is a process that involves the entire country. If this is the case I find it difficult to make bitcoin a global currency ... !!
You seriously do not need any country to accept bitcoin to use it as a global currency and all you need is people accepting it as a mode of payment and as long as there are merchants accepting bitcoin you can use it as a global currency, why everyone is thinking about making bitcoin their version of fiat currency. Bitcoin is a global currency simply because you can trade freely without any boundaries and that is what you need to be accepted as a global currency.