Ultimately they don't care too much about this kind of tampering, except when it has the potential to damage their reputation. They otherwise don't care about the specific outcome of a bet; they make their money regardless.
Good luck proving it.
> IIRC, someone bet on a streaker at the super bowl, did the streaking themselves, made 6-figures on the bet, bragged about it publicly, and the market negated the bet and recovered the money.
Yeah, exactly. Far easier to prove and to even get the idea to investigate that person in the first place.
So as long as you are subtle about it they won't even investigate, as a public investigation would make it seem like tampering was common.
We are only seeing the very dumb here.