Indeed. It's so much bigger (in notional terms) than the underlying stock market that you can manipulate it by making large bets in the derivatives market, then move the underlying cash markets with much smaller bets, and collect profit.

That is what Jane Street (IIRC) was accused of. Some of its traders then went to another hedge fund and did the same trick there, reducing Jane Street's profit, and ended up being sued by Jane Street. (BTW, Jane Street claims it was not manipulation, but basis trade arbitrage.)

Of course, 9 out of 10 gambler end up in the red.