I'm not sure if this was suggested or asked for but can we get a market for VAR, let's say for Premier League matches?
Another thing is what would be considered a VAR review. A review can take place in the background without the referee actually going to the monitors to check himself. Would that also be considered for the bet or only when the referee checks the footage himself? What if the VAR referee makes the decision, cancels, or awards a penalty/goal/red card without the intervention of the main ref?