You take all the risk, and if it pays off, the government will be there looking for their taste - 30 to 45% of your gains.
From where I'm at, Capital Gains Tax is capped at 6%, and 30-45%, I think, only applies to rich countries with almost free everything.
With the move from every corner regarding crypto regulation, I heavily doubt that you will actually find an exchange that imposes no KYC to their customers. Some don't, but once you reached $1000 on trading volume, you are forced to submit, else you cannot continue your trading ventures.
Either way, they would still tax you even if no profit was made. You can't just go around and say that "hey I sold this to Alice, I made no profit okay?" and expect them to believe your story. Taint analysis on the blockchain is present. The only thing to do is perhaps change to a different altcoin then back to BTC then again, point 1, good luck finding an exchange with no KYC.
This is what most politicians do: transfer dirty money into Swiss bank accounts. Perhaps you can do the same, but then again exchanges hold the transaction records so I don't think you can go around with that.
None that I know of.
Swiss bank accounts are the only bank accounts that you can ensure to not give your banking info to other countries, though of course it will raise red flags once you do it. And with most countries closing their exchanges from outsiders, I don't think the freedom to link offshore bank account to e.g. an American exchange would still be possible.