Hello friend @crypto.piotr
Market manipulation is evident, especially in the case of cryptos is even more evident, because of the volatility that characterizes this environment.
I think that when we are in bull markets like the current one, is when we have to be more careful, because at any moment the price can go to the floor. And unfortunately most of the investors are small ones, who do not always respect the rule "do not invest money that you cannot afford to lose ".
For this reason, they often get caught in these traps that cause the price to rise and then plummet.