Because taxes are for the expenses of the government to fulfill their duties for the people. Even though we do not agree to pay them or take it as a burden, we do not have a choice but to support and pay our taxes properly.
So, in fact, we have no way out. Such a puzzle without a break. But already in corrupt countries there are ways to get around it and not pay.
Tax system is limited to people for their assets but some governments even in developed countries governments are accentuating to consider the crypto market as an asset. All of us know that this is a digital currency and we should not pay tax for it, this is unfair decision to consider it as asset. If we buy houses and lands with the profit then implementing tax is fair.