I think the question needs to be a bit more specific. It always depends on the country you're in. And the tax laws that surround capital gains surely. We know that some countries like the US and UK derive joy in taxing the existence out of their citizens. But if you are lucky enough to come from a less inconvenient system, good for you. However, it is always necessary that we abide by the laws. Because in the end, any funds unaccounted for will be discovered. And this will only create bad reputation for Bitcoin investors.