> I'm from Germany and sold my ETH at the peak some time ago with a profit of ~80k. It was a very strange feeling to receive that completely untaxed, as everything else is taxed here.

If you buy a car (let's say an oldtimer) and sell it for more money than you bought it after one year, it is also tax free.

Real estate is also tax free after two years (or ten years, depending on whether you have lived in it).