everything is manipulated to some extent but you have to remember manipulation is expensive.
anyone 'dumping' millions of dollars worth of stock at the market is not interested in getting a good selling price.. you lose a lot of money doing this.
the recent price action looks like a normal market with some liquidity fluctuations. the price movement is normal.
the reality is their is trillions of dollars of normal currency looking for better value than the current system can offer. a small amount of this money flowing in or out of crypto will cause high volatility depending on the amount of liquidity in the crypto market.. it will stabilise as the cryptos get bigger.