A legitimate use of crypto "currencies" is defense against hyperinflation. Ask anyone in Venezuela.
But if all you want is your money to be backed by something that intrinsically retains value, there are many standard choices. Like _foreign currency_. Or something more involved, like stocks and bonds and commodities contracts.
Or you could just plain use precious metals.
Cryptocurrency doesn't uniquely solve the problem of inflation, but it does introduce a lot of others. (Including the risk that a country's entire Treasury gets drained because an office worker plugs a USB stick they found in the parking lot into the wrong computer)
Governments have fallen for the siren call of inflation ever since Nixon. They won't give it up and adopt any standard, gold or otherwise, because it would imply they have to be accountable for finances.
This is why private individuals have to use more creative ways of storing their value.
Stocks and bonds are not bearer assets, so you have to sell them before spending them.
Commodities are inconvenient to carry (though in some cases maybe more convenient than wheelbarrowing cash).
Real-estate is much less liquid, you can't sell or spend 0.01% of an apartment.
This is objectively false given that the article is about how easy it is to scam people out of their bitcoins.