This is exactly the same thing as cash. If you buy a major currency, like usd, euro, bitcoin, ethereum, etc, then it will be much more stable than some random currency. Would you trust a cash currency that was created by some random dude in an alleyway?

Cryptocurrency is basically like digital cash. No one can control how you spend it, or take it away. But you can’t undo transactions without tracking down the recipient, and getting them to give it back. If you don’t trust anyone, cash and crypto are the only real ways to pay for stuff.