Imagine if US Dollar were a cryptocurrency, it would have been one of the most shitcoins ever.
I don't think so, because US Dollar is still the most used to the point that it is used as reserve currency and used by most countries. There are some countries fiat currency that the value is eaten up faster by inflation compared to USD.
It has proven to have performed even high than Gold in recent times and is probably going to be top #1 of all cryptocurrency for as long as it keeps existing.
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Bitcoin is already the number one cryptocurrency and nothing can change that. It is only if another coin can be created that will give 10x of what bitcoin is solving that bitcoin will not be the king of crypto, because altcoins are duplicate of bitcoin.
Bitcoin is only a decade and five years old, the interest it has yeild and it's growth over the years both in price and community support has shown its uniqueness and should be taken as a serious investment. Don't trust a currency that depreciates over the years with your investment rather take advantage of bitcoin volatility today.
Any investment in fiat will always perform poorly compared to an investment in bitcoin because it will be affected by inflation. However one cannot do without fiat, and that is why it is good to have both bitcoin investment and traditional investment to enable over the hardship that is caused by inflation .