You are mistaken, and you should rather advise with tax consultant in your country.

Now, you compare Bitcoin to some paper money and in that context you say how there is no tax on Bitcoin. But that is mistaken concept that you have.

The tax is not on money. Tax is on income, or transactions, importations or similar. Governments are not taxing money. They are taxing income. That is not the same.

You can receive to your account 10 million dollars. It is not money that is important, but the income.

Maybe 10 millions was a loan? There is normally no tax on receiving a loan.

Maybe 10 millions was insurance payment? Maybe in your country insurance payments are not taxed.

Maybe 10 millions was sales of services? Then it may be income, Now the tax come into question.

And income comes always after expenses. What if you had 9 millions expenses? Then 1 million is the income to be taxed.

In majority of countries, the law is such that gives to the citizen the obligation to report taxes, regardless if the money came to bank account or not. And it is not all just about money, many countries are taxing any kind of capital gains. For example, in many countries, if you would receive gold, or gifts, or any kind of stuff which is not money as gift, you could be taxed. And if government does not know about it, they made a law to say it is your obligation to report it.

So the statement that Bitcoin is not taxable in many countries is simply not true. Because laws don't say "We tax Bitcoin or we tax US  dollar", those tax laws don't speak about any particular currency. They speak about income, gain, capital, wealth,  that is what governments of the world are taxing.

They don't want to be limited to one currency, they want to take anything from you as much as they can take it.