altcoins that don't follow the movement of bitcoin, for example bitcoin turns green, so I am suspicious of that altcoin, mostly occurs in new altcoins which afterwards only become ash coins. this seems to have become a culture for every altcoin to follow the movement of bitcoin, on the other hand the biggest trust factor in cryptocurrency which makes bitcoin the leader for all cryptocurrencies. We can see this if we pair bitcoin and altcoins with USD, so we can see the movement of the two
I think manipulation can occur for altcoins because some people or whales can move the price of the altcoin. After all, the price is still low at the start of its launch, so many people follow its movements.
But for bitcoin, I think it's very difficult to manipulate the price, especially now that the price of Bitcoin is over $20k and even though some people have a lot of Bitcoin, I'm not sure they will want to move it unless they have a specific purpose. But I don't know. I never thought about that because, in my opinion, we also don't know whether a group of people is really manipulating bitcoin or altcoin.