but you can't. you can't send Bitcoin or Eth around the world for "next to nothing" today. not in a reasonable time frame. and that isn't accounting at all for the massive power wastage in the Bitcoin case.
It will currently cost you $1 to send any amount of ETH to another address and that transaction will take 3 minutes. For $1.30, that same transaction will take 30 seconds.
You can do those same transfers cheaper and faster on an Ethereum layer 2.