I did not claim they were the same. Bitcoin is one of the more popular cryptocurrencies. You are right: How crypto is stored and traded differs from hard currencies and sits in a digital exchange instead of a bank, wallet, or purse. But the point is not about storage differences...they are all currencies and the basic function of a currency is for it to be traded for goods or services. Currency is what moved humans away from the barter system.
Hard currency values fluctuate around the globe based on certain macroeconomic factors like relative inflation, monetary supply, etc. But within any given country the value of the currency is the same: $1=$1. Local inflation may mean it buys less, but you can always exchange your $ at a bank one for one. The USD has only been devalued 1 time, in February 1934 as part of a post-Depression change to Roosevelt's gold policy. Other countries, especially in the Third World, have had to devalue more frequently due to economic turmoil. Many of us have seen pics of post-WWI Germany when hyperinflation made the Mark nearly worthless:
https://www.dailymail.co.uk/news/art...World-War.html
Once the major currencies have digital equivalents their value compared to each other will still fluctuate based on the same reasons they do now. And a digital dollar will still be the same as a paper dollar.
When that occurs where does the value of an independent crypto currency come from? They are stored in the same manner, transferred and recorded in the same way, but they don't carry the cache of official currency. What's the point in having them anymore?
The USD is backed by the Federal government...perhaps Full Faith and Credit is overly simplistic, but this article explains the concept well:
https://vaulted.com/nuggets/what-bac...states-dollar/
The government won't need to ban crypto; the masses will abandon it because the digital dollar accomplishes the same thing without the same level of risk. Current crypto currencies were certainly innovative, but in the end they will become sacrificial Guinea Pigs once official crypto is rolled out.