Bitcoin is controlled yes but not in a way that it was been manipulated by the big whales or institutions because the coin is the most decentralized and fair among all other cryptos. Altcoins move up and down because this is the nature of cryptos. It's called volatility. Bitcoin has this too but the rate of Bitcoins volatility is much higher compared to them. It's also known that Bitcoin can manipulate the altcoins but some small altcoins can be manipulated by someone else. They are often called as pump and dump.

These are the one's that we must avoid because they are not contributing anything in this space. They are only here for business, to make a profit and the only one that can profit the most is their creators, not the investors.