Russia is looking into ways to legalise and more than likely tax Bitcoin. Poland already taxed 18% when you try to cash out your hard earned coins. It's up to government in each country, some don't have time now, some already did to get more revenue and some will do it in the future. Remember where is a lot money involved tax man is always there.
Yeah, transaction fee is the kind of tax and this is the right of government to collect taxes without this income there will be no development in the region ad all this taxation will also be implemented over bitcoin and there will be eases for the government and citizen for paying and collection of tax and bitcoin will also reduce taxes amount as due to its volatility and all this the natural thing no worries now.