Doesnt matter on which one you would be touching up, it would really be profitable as long there's a demand into it.
On both sides, for the gamblers and for the operators. The profit is there mostly on the operators. And for the sportsbettors or gamblers for online casino games, the profit relies on their luck and analysis.
This varies because no one can guarantee that's going to be profitable on them as we have to deal with unlucky moments. While for the operators/house, the edge is always on them.