I wouldn't. Of course, in my country cryptocurrency profits are for free because the high court of the EU declared cryptos as a currency (if you go on holidays outside of the eurozone, you don't pay taxes either for the foreign fiat currency you buy right?)
If the situation is different in your country, I'd argue that they aren't realized profits yet until you convert to fiat? You could still lose it all (from their perspective) so would be useless to pay taxes on income you never realized right?
But I'm not a lawyer.
If you buy for example usd with eur to go to USA just for a holliday trip and the usd goes up, there is no tax to pay. But if you make trading betwen currencies [= buy and sell in a profit logic], you then have to pay taxes on your profits (even in the EU). The same logic applies to cryptocurreny if bitcoin for example is recognized by the law as a currency. [Switzerland may have a different approach on that question]