Hey there, it's Graham the author of the piece here.

I didn't include games because my focus wasn't really on consoles but rather smartphones, tablets and PCs and in that sense games are distributed as just "apps" and as you would have seen, I did look at apps.

The reason is somewhat obvious, the source is Macstories and multiplayer online gaming is an area where Apple would not provide an impressive showing.

They're probably the same graph as apps.