It definately can be done and I have stated how.
Besides if crypto goes into general use it will grow and grow for a long time. No need for someone to lose in order for others to get get filthy rich.
However the manipulators will rather scare people away by causing massive volatility and prevent general use. They don't want many people prospering. Shame on them.
Crypto manipulation is another way of earning money because of it's history of effectiveness as some people are rushing to invest when some altcoins were starting to pump but after few days suddenly that Altcoin will drop Lower than the price value that you invested.
That's really on of the worst experience when crypto investor is investing out of FOMO (fear of messing out)