The world isn't a 0 sum game. And 1 sat from a person with 100 ₿ appreciates exactly as fast ast 1 sat from a person just owning 1 sat.

And gives us everyone a way to escape a broken system. Tools don't need to be perfect, just better than everything else available at the time.

Bitcoin is being used to move purchasing power between very poor countries where the option before was paying 50% between taxes and Western Union fees (or whatever company).

Of course already wealthy people can potentially buy more pieces of any tool. But I would argue that in this case, Bitcoin is way more important and benefitial for the poorest. Rich people can choose where they live and have a lot of options to preserve their wealth. Poor people don't.

You could say a tool that purifies water is unfair and evil because rich people can buy lots of those devices. But in reality, having access to clean water is not really a big problem for them to begin with, whereas for poor people it can be a life changer.