Forex can't be easily manipulated since its value depends the economy of the country so technically, there are no whales there that tries to manipulate its value.
forex also manipulated by whales group too, we ever see price move with high volatility only in few seconds or minute. they also could pay someone with popular influence to drive market as they want.
I can see that Stocks and cryptocurrency are more prone to manipulation, if you own big amount of money you can really influence the price and that's the job of whales aside from making money out of it. Manipulation will stay, so its better to learn how to ride with the trend and follow where the money is going, don't try to beat them because you can't.
manipulators always occur in any market as long as they could generate profits here. cryptocurrency market maybe be best place for their action, alot coins have no strong fundamental so they will shake it till people panic and whales buy it.