My understanding is this: people have valuable physical assets and they have something called money. Money helps people to live together in large cooperative groups because we agree to use it as a store of value. It can be in the form of physical notes or numbers in an account, etc. If we want to live together in those large groups and have complex relationships with each other we need to use money. However some people have accumulated large amounts of money making them disproportionately powerful in our society.
Our economic system allows wealth to be passed on from generation to generation creating a kind of multi-tiered caste system. Sometimes a family's wealth stretches back many generations to when human beings did things which we no longer deem ethical such as slavery. Some people who made their money recently did so unethically, such as the bankers who caused our economic system to crash. Other worked hard for their money but the predominant determiner of how much value a person produces is on what tier of the system they were born.
If people are dissatisfied with the current distribution of wealth why should they agree to play a game that is rigged against them from the beginning? They have no obligation to honor the store of value that accumulated wealth represents. The only reason they agreed to start using money was so that they could live in large complex groups and enjoy the benefits of that arrangement such as the development of technology, medicine, improved nutrition, etc. If there are aspects of that arrangement which they do not like; such as wealth accumulating in concentrated nodes, they are under no obligation to fulfill the 'promise' that the money is supposed to represent. They can achieve this redistribution by ditching FIAT currency and using an egalitarian cryptocurrency instead.
As I said, money is the absence of wealth; nobody wants money, what they really want to do is get rid of it so they can enjoy wealth. No matter which money you use, it doesn't change who owns what land; so long as a small group of people own large swathes of land, and charge other people to live on that land, and prevent people from claiming that land for their own, money is always going to move into the hands of the few, and the divide continues to grow.
Consider the following example:
Two men are using this currency; they now have $10,000 worth of this coin each, for example. One man is the CEO of a global corporate empire. The other man, who works for said corporation, has an apartment and needs to buy a car to get to work. Are they now equals?
Even if money disappeared completely i.e. communism, if the few still owned the many, the power structure remains unchanged and you would still have an enormous disparity between the aristocracy and the working class. You're not redistributing the wealth, you're just changing how that wealth is represented; the rich still own all the wealth.