Today I have noticed that one guy caught by the police for holding 13 billion USD in the casino site. If there is no regulation and awareness of the crypto currency you can choose the wallet belongs to different country and hold it. If there is regulation implemented you should bear the tax according to country tax paying norms says. For example you earn the bitcoin in signature campaign. It is service oriented work so you have to pay the tax according to service work amount estimated.
Agree with you. You can pay taxes as per the tax slab or revenue guidelines of your country. Rewards gained from campaigns and bounties are services oriented income and Bitcoin Price inc. will be considered as Short-term or long-term capital gain. For more detail, you should consult with a professional tax consultant or Accountant.