Taxes and regulations are two completely different matters. You're also proposing a new tax on what exactly? Crypto still requires you to pay all current taxes. Different countries treat it differently, so which ones you pay differs from country to country. In the UK Crypto is treated like foreign currency, putting it inline with all existing legislation on corporation/income/capital gains taxes.

Additionally, taxes are damaging to the economy, so the more taxes, the more damage you inflict. Taxes are a way for government to raise money to pay for itself, not there to arbitrarily punish people for making money just because "they should pay more tax"