I think the point is more that if it's already happening at this level of adoption, and these are only the ones we know about, surely there are many more where this is happening and we don't know, and as adoption increases, it will get worse and worse since the liquidity on the line will be much higher.

Elections, wars, the economy, healthcare systems, laws, court cases?

The example you provided does look like some insider trading type of stuff, just like how 1v1 professional sports players will sometimes intentionally lose after receiving a bribe to do so, but both your example and sports don't really seem to have any kind of meaningful impact on anything or anyone who isn't gambling, no?