The rate in this country related to the incomes taxes it currently at 18% (the highest has been 20%) So what? Not much difference compared the incomes.
Any income shall be taxed, there is nothing wrong. At least the citizens know where the government stands, but generally speaking, any citizen knows there will be a tax.
https://tradingeconomics.com/country-list/personal-income-tax-rateCryptocurrency is a gray area, it is not just any income that should/can be subjected to tax anyhow. What happens in the case where a declared profit on cryptocurrency suddenly loses 70% of its value just before there is an intention to pay tax?