I'm not sure if this is also happening in your country. Is anyone honest enough to declare his/her crypto assets? For me, taxes should be considered ONLY if it is officially accepted and become legal tender.
It should be so but each country has its own regulations in regulating the tax system that is applied and if we consider it unreasonable, then what can be done in such a condition. My country imposes tax on crypto and I can't say it is unreasonable because even if I said so there would be no effect that could be done. If we want to be honest we hope that there is no tax imposed on crypto but the government knows there are many benefits in it so there needs to be tax.