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No one has 100% control over the markets, but it can definitely be controlled to a certain extent. Whales, news sites(crypto and non-crypto), certain personalities(crypto and non-crypto), and even the government, can affect the markets one way or another.
Though as time goes and liquidity gets better, it gets harder and harder to manipulate BTC's price.
Indeed whales and some news and personalities talking about bitcoin (bad or good news) can affect the market, but if people who own it not sell when price is low then can be hard to affect it for long.