Money and power goes hand in hand, if you have money the next thing is to have the power and discipline to control it because nothing is constant in this world, without control you can lose both your money and influence which is your power. Bitcoin is not a physical business it is an investment that can give you returns on the long term. You don't have to depend only on Bitcoin profit to survive because it is volatile and you will hodl for long term before you can get profit, if you have more funds you can diversify into other profitable assets like gold and real estate, all of this assets combined can make you more financially stable and powerful.
Not all the time. I have seen nations where dictators just take away the rich peoples money for example. Yes that is not a common thing everywhere, but it is also not unheard of neither. Power is power, and if you are powerful, then you do not need money exactly, it's great to have it, but not needed.
Just for an example, everyone keeps saying that Elon Musk is the richest person in the world right? That is true, financially he is the richest on paper, but can you tell me that he is richer than Putin? Or that weird north Korean fella? Or the Chinese leader? I mean these are all obvious, specially Putin, how can you consider Putin could be poorer than Elon? That is obviously not true, yes on paper he is not, but Putin is richer. Same goes for Saudi King for example, basically, all of Saudi Kingdoms money is his.