For example, I'd pay (1M€ - 20k€) x 34% = 333k€ of taxes on capital gains. I'm not sure how the taxation works if you try to dodge it by relocating to a more tax friendly zone. I've heard some horror stories about Finnish companies moving to Estonia for tax benefits only to be taxed with fines for the gains that the company made while it located in Finland. Would the same rationale apply for personal capital gains?
You can freely trade between cryptos, for example between BTC and ETH, without triggering the capital gains. The moment you leave cryptoland, I believe they use the first-in-first-out (FIFO) principle to calculate the profits.