some country are not accepting bitcoin and bitcoins are illegal in their country this is one of the sadest part where you can't earn bitcoins for free and also they can't mine because they goverment hates this currency what if their president using bitcoin and change everything into bitcoin currency probably people in their country who don't know what bitcoin will be the famous currency
Well, in many countries where the bitcoins are not so popular or say banned, still people are using it.
Gambling is banned in India for example but 90% of Indians gamble, either professionally or friendly. So, that banned is just a lame excuse if anyone tells that as a reason for not using bitcoins.