Bitcoin is already legal in lots of countries. If you check Wikipedia you’re going to see that there are lots of countries there that are marked as countries where Bitcoin is legal, and there are places also marked as where it is illegal. So, it’s already legal in lots of countries,
Yes, some countries have legalized Bitcoin but they didn't legalize it as legal tender and this is what makes El Salvador different from all the countries that have legalized Bitcoin.
To me, the Ukraine and Greece government seems not to be serious about the issue of Bitcoin legalization because they have been on this talk for a long time before El Salvador think of using Bitcoin as legal tender and if this continues they may not legalize Bitcoin while they continue talking about it every year.