In many of the countries, where AdSense has been banned due to some reasons by Google. That was only people's perceptions, Google just strict their polices for few Asian countries namely China, India and Pakistan.
Your next question will be that, if AdSense is not banned so how you can get verified AdSense account?
Answer: 13 things to Do before applying Google AdSense Account.
Personally, i wrote the above article for user convenience to understand AdSense problems easily.