Saving is the first thing that comes to mind if you think of investing in future. Without savings you will not be in position to invest and If u think from the middle class family point of view then they have only option of saving as their income is not higher they can't think of investment at that stage.
Without investing you will have nothing to save.
Let's say you are a 18 year old, with no job, and living on parents money. How would you start life?
If you have like 1000$, would you rather give it to a bankster on 1% interest rates, or give it to crypto currencies with a litte more risk but considerable better rewards.
The risk-reward ratio is favorable, its a good investment.