Probably without intending it you've gotten right to the heart of what's at dispute here.
The common language meaning of gambling is too broad and captures things that aren't legally regulated as gambling such as gambling (again common meaning of the word) with futures contracts. Sometimes gambling is dressed up a speculating, but one could argue that one can speculate as a participant in many card games since they allow room for analysis and aren't pure chance. This is what the legal dispute comes down too.
The other is the debate for the value of the truth discovery. Some folks buy it and others don't. SCOTUS will likely take the case to resolve the split between the circuits and we'll if the value of this even enters into the decision or it just comes down interpretation of the statutes.