Why do you agree with the rule? As far as I can see it, after a 10 second ponder, there is no reason for it if you have no control over the outcome, I.e your team isn't involved.
Sure, you may have better information than others, but is that not a problem for the betting company rather than world rugby? Or maybe such a company sponsors the world cup? Or just world rugby is acting on behalf of all betting agencies out of the kindness of their hearts? It is more efficient rather than having all of them do their own policing. And, I suppose if part of fans' interest is derived from the joy of betting then I guess world rugby has incentive to maintain the integrity of that aspect.
Ok, so maybe it makes sense