No country wants their currency to be volatile. It’s bad for business. Central banks shudder when their currency appreciates because exports become expensive. They rather prefer devaluation like what’s happening in China and Japan. However, they also don’t want their currencies to drop in value so fast because it will hurt the purchasing power of its citizens.
That’s why central banks manipulate their currency in the free market by quantitative easing or increasing interest rates, etc.
Now, Bitcoin with no means of controlling its value will rise up exponentially and people won’t spend it. And then when it swings downwards, businesses won’t hold it. Bitcoin may be valuable as something else, but never as a currency.
I don’t think Nubits is really pegged in a sense because it’s operating in a free market. A peg is when an entity like a country will guarantee fix rate at their expense like what happened with CNY years ago and Iraqi Dinar.
The US Dollar is freely traded and has volatility, but I’m sure the Federal Reserve is making sure it does not rise too fast.
Imagine your one USD which equals some 1.10 EUR today and next week it becomes 2.50 EUR, I wouldn’t spend USD at all and spend EUR instead.