I don't have the words to express my contempt for the kind of people who would abuse a good system like this. All I can say is that I understand and support the decision that has been made. It's sad, for me personally it will probably mean that I stop sharing freebies. Trying to improve and create better models actually became more fun with that extra incentive added, however modest the reward.
Again, I fully understand if the program is terminated for good. However, might it be possible to add certain conditions to joining the program? Like, you have to have been a member for at least a year, or have so and so many downloads? That could maybe weed out the most obvious scams like duplicate accounts etc.