Will there be any prevention against cheaters during these betting matches ?
I would imagine as much as can be provided.
There is plenty of anti-cheating software available. It would make sense to even have an admin monitoring matches.
This is CounterStrike after all that we are talking about.
We all know there are cheaters.
And ways to cheat.
But at the end of the day, I am sure you will have the ability to choose how much risk you take all by yourself.
And play against friends, on trusted servers.
In short, everything that applies to CounterStrike today. Already.
Unless you fly to CAL or something, and only ever play LAN, you cannot ever 100% avoid or prevent cheating all of the time.
The community has had 15 years or so to come up with solutions though.
I am sure the Dev will probably use some of those?
That is a great question. Maybe the Dev can expand on that with anything that is actually planned. I cannot comment on that.
But I wouldn't be too worried about that one.

Play with friends.
It is better that way to begin with.