The manipulation happens more often with low cap tokens and the large ones like bitcoin and ethereum are mostly affected by news which many will also view as manipulating the market. The bitcoin market cap is so big that it can be manipulated by a single entity just like we see in other low cap coins. Asides news, I haven’t seen something that big that will have effect on the bitcoin market on a less broader scale.
Market manipulation happens more in altcoins and those with low cap because with small quantity of dollars, you can have an effect on the price of the coins. Before anybody will want to manipulate the price of Bitcoin, they first have to own alot of money and still they can find it hard to want to manipulated the price therefore it is only through rumors, news and fud that they can use to manipulate the price. After the news has had its effects on the market then they can begin to sell If they want the market to fall or buy when they want the market to start rising. Cryptocurrency market is full of manipulation but you can avoid getting affected by not being moved by the news or the market. Just ignore them and continue to keep investing base on your strategy and you will be safe from manipulation.