Wolong did that to Dogecoin and other alts. He made a fortune pumping the price and dumping on his co-conspirators. He never tried the same stunt with Bitcoin because it costs too much money to manipulate Bitcoin's price. Five million dollars spread across all the exchanges that matter isn't enough tp pump Bitcoin.
i think the proposal in the OP and wolong was not based on 5 exchanges..
the intention was not to cause a permanent rise..
its just a pump&dump on one exchange so the organizer (guy in charge of shouting when to buy and sell) can profit.
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If done correctly, the guy running the show would profit the most, but everyone in his group would profit. In the top guy's best interest to make sure everyone profits (no matter how marginally), so that he could rinse & repeat.
Think of it as knowing who controls the music in a game of musical chairs -- all you need to do is watch that guy. Sure, he'll grab a chair before you, but you still have a clear advantage over everyone else.
Meaning you rip off those who are not participating in the scam. There's a reason this sort of thing is illegal.
OP, you want to get rich? Learn to serve others by providing services they actually want and will pay for, earning you an honest income. There are a lot more prosperous people who've gained wealth this boring old-fashioned way, compared to scammers and get-rich-quick layabouts who mostly wind up rotting in prison or their parents' basements.