Good work! We'll never be able to 100% wipe out abuse, but we can dramatically reduce it by downvoting it when we see it so it's less likely to be profitable.

I think comment cloning is actually a particularly destructive form of abuse since it actively disrupts and impedes discussion. If someone leaves an insightful comment on a post and it's immediately cloned, the post author and other readers have an additional barrier in determining who they should reply to for a constructive discussion.