1 - I don't have to explain my profits when they are obtained via a non-regulated mechanism.
Well... selling drugs isn't also regulated and lot of people obtain profits from it. Never the less, although this is one activity deemed illegal, people DO HAVE to explain from where the money came from precisely to prove they didn't obtained it from illicit activities nor from tax evasion.
4 - It's up to them to prove that I'm evading taxes. And I dare them to do that! Where is it written that selling ETH obtained via mining is subject to any taxes?
Digital mining no, not yet. It isn't yet subject to taxation as actual mining. Give them some months and I bet you'll need a license to mine!! Remind you of the leaches sitting in the government (Béééhhhh)!!
7 - Crypto currencies are not regulated, hence one cannot be accused of breaking the law by tax evasion. I pay all my taxes!
It's not the mining or the digital asset they want to tax. They want to tax the money you made from it. Although they don't do it yet, they might. Specially if some bank, exchange or any other third party tips them on the cash you made.
