Let me see if I can explain.
Those countries or places I mentioned above have legislation (laws) in place for online
gambling. Making it legal to gamble online. I am sure it is regulated and persons there may have to pay taxes on winnings. The license for a poker room must be accquired by them from the government in order for them to legally operate think of it as you would think of a liquor liscence.
All other countries apart from those above has either laws saying it is illegal to engage in online gambling or there are no laws in effect pertaining to online gambling in effect at all. Most countries fall into to category of no laws or legislation. In countries with no laws some view it as technically legal. Other persons and organisations (Like Payapl) take the perspective that no laws mean that it is illegal or no laws mean that their operations can be vulnerable.
Example of what I mean by vulnerable - lets say a poker room does not pay a payment processor their fees, in one of the countries with no laws a judge may rule he cannot make a ruling because there are no laws, meaning the payment processor cannot use legal means of recovering funds.
Like with most things laws does not mean that games do not exist, People and organisations do not always follow the law thats why online gaming is still avaibable almost everywhere. People will still engage in it until the governments step in like they did on Black Friday in the US.
I like most live in a country with no laws for online gambling. Even the physical gambling laws here are not clear and industry is not regulated and the laws are not really enforced. Since Black Friday I do not leave funds in Poker accounts too long. Once I run up a certain limit I withdraw and store my
bankroll elsewhere. Because when there is no legislation you never know when another incident like Black Friday can occur.