hmmm....
"Each app has been downloaded an average of 3600 times."
No they haven't.. A bit of looking further in the original article, and finding the actual list of trojans and apps shows that the'"average" is skewed by only a few really successful campaigns ( [popular game title] + "free" will attract a guaranteed number of idiots.. Quite often repeat idiots.. ), but most have download numbers in the 10's and at best 100's.
That's an awfully low success rate..
It does surprise me that the "[popular/major game title] + free " names don't immediately cause red flags to be waved though... That trick is as old as well... Ugh! the Caveman.