I'm 100% sure that everyone in Denmark is going to declare his crypto holdings to the authorities. There's no doubt about that. 
They will, ...
The problem is that the government already knows how much Bitcoin you hold, as the majority of it is acquired through KYC exchanges.
Unlike Monero, you can’t simply claim you lost it in a ‘boating accident’ - Bitcoin is easily traceable. If you say you've lost access to your Bitcoin, they could simply blacklist it and prosecute anyone who tries to use it and ban you from exchanges.
And, what are you going to do with your Monero?
Let's see the options:
- sell it, taxable registered event
- buy stuff with it, taxable registered event
- go to a country where is not taxable, thing you can do with Bitcoin
- print a piece of paper with your key and the words "I'm rich" and take it to your grave
You sound like one of those guys who is so happy he can pay for stuff with cryptocurrency anonymously then goes on to type his whole name and address in the delivery address and the warranty certificate.
Also, these gains in Monero which the government would tax you on, are they in the same room as us now?