Crypto Currency And Others

How has crypto currency made the world better?

It seems as worthless as are gold and diamonds.  Given their market value, gold and diamonds do little for the actual people who extract these things, the miners.

They get produced, then somebody says that they are worth a lot of money, and then other people allow actual things to be bought with these statements.  "This token here is worth a lot of money."  "Great, here's a house."

It seems like war:  we throw tonnes of actual material at people far away to try and kill them, the result being nothing of lasting material value to anyone.  And yet, some people somehow get rich doing this.

Money, as a facilitator of barter, is in itself worth nothing.  Money is only valuable as a means of dealing with distance or barriers to communication.  In a face-to-face barter, money is useless, valueless, an impediment to exchange.  

Yet gold, diamonds, crypto are somehow presented as things valuable in themselves.  They may have symbolic value, yet even in that case, how much more valuable are they than a picture presented lovingly to you by your child?