Leak sites and copyright removals
Leak sites need their own plan. Google does not decide whether content is copied; it acts on valid copyright removal notices from the rights holder, and removes the specific URLs in them. Since 2012 it has also said that sites with high numbers of valid notices may appear lower in its results.
In practice that means a routine, not a one-off: find the copies, send notices for each URL, and repeat when new ones appear. It reduces the problem. It rarely makes it disappear, which is why the other half of the work, making your own pages stronger than the copies, matters as much.