At some point there is enough money triggered for a specific outcome of the game.
If hurting someone credibly increases the odds, it's not if but when will people cross the line.
While the opportunity for this isn't zero, the reality is that there are safer and more lucrative ways for criminals to make money, especially for those who have the aptitude to pull something like this off.
"Revenue in the Online Gambling market is projected to reach US$97.15bn in 2024"
https://www.statista.com/outlook/amo/online-gambling/worldwi...
There is already $97 billion USD/year. Where is the evidence for what you're saying?