Do they really? I often encounter this statement. And i have no idea as to why. This past few days, bitcoin is on the rise and most certainly than not altcoin's price surely follows. I am not saying this is bad but altcoins have very little in common with bitcoin. And they are certainly not carbon copies of bitcoin either. Why the heck is their price so closely connected despite being so fundamentally different?
Cryptocurrency really repeats bitcoin price movements and this is due to the high level of bitcoin capitalization. This circumstance allows Bitcoin to exercise price dominance over other types of cryptocurrency. I personally do not like it at all. A decentralized cryptocurrency, I think, does not need a price dictate. It seems to me that with time the situation will change and the decentralized cryptocurrency will gain decentralization in this matter too.