sad but true...i believe some big people holding a huge amounts can really do that,they can play the market they can manipulate the prices and the news also have a huge contribution with their fuds and fake news.so if the value was down they can easily buy more and ofcourse they also can pump it.easy money for them
Yes it does happen and millionaires jumping in can make a good shake with the price specially with cheaper tokens.
Who can stop that? None. The problem will be low amount holders which will panic and decide to just sell it even with a loss. That is a shame for those tokens that have a real good project. They will lose everything just because of whales playing with the price.
They must really get in touch with them to at least make them see that a long term holding will be more profitable instead of just selling with little profits in their pocket.