The reason why Bitcoin is the number one cryptocurrency is pretty simple: It was the first one. This first mover advantage persists, because Bitcoin quickly established the biggest support both from users and from developers. Having the biggest user and developer base maintains a strong network effect, that tends to draw in more users and developers, because the system appears attractive and is well-established as a payment system.
For any altcoin to compete with Bitcoin, it would have to offer something revolutionary new and useful, that can't be implemented by Bitcoin. Today's altcoins are mainly a testing ground for new ideas, that will end up being added to Bitcoin if they are good, leaving the altcoins that first introduced them behind (a current example for could be rootstock vs. ethereum).
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Good you have given best reasons ever. Few other reasons are as below - Better Than Gold
Once a person has accumulated wealth, security becomes a big deal. Dollars lose value to inflation. Stocks are risky. Bonds are risky. And for the safety-minded investor, bitcoin solves two problems in one move:
Its value holds up when the markets tank.And it doesnt take up any physical space.To hedge against inflation, most people look to gold as a haven for their wealth. After all, its served as a store of value for people for centuries.
Right now, $1 Million will buy you about fifty pounds of gold at $1,319 per ounce.
Sure, you could easily bury that loot in the backyard for a rainy day.But in an emergency where you have to say, evacuate your home in a hurry that fifty pounds of gold becomes a heavy burden quick.On the other hand, bitcoin is weightless and is stored eternally on the blockchain.
So as long as you have access to the internet, you have access to your bitcoin holdings no matter where you are. Heck, as more businesses around the world accept bitcoin as payment
there may not even be a need to hold any countrys official currency in the not-too-distant future.