Comment by otterley

Again, they don’t have to trace actual data flows to have sufficient evidence to convince a court or jury that Meta is in breach of the law.

Other examples of evidence include an admission from a Meta employee during a deposition that they were instructed to download a bunch of copyrighted material and the undertook the efforts to do so.

Or, perhaps the plaintiffs seized the machines used in the scheme (happens all the time following a TRO and discovery motion) and found whole copies or traces of the copyrighted works on them, or even local client logs that suggest that it was done.