Massive piles of documents, released erratically and possessing apparently random and sloppy redactions with inconsistent formatting rules are a common tactic in some corporate cases as well, since they intend to wear down opposing counsel through exploitation of reptile theory.
AFAICT it's not well considered by DoJ that this works roughly in proportion to the technical aptitude of opposing counsel. The public has excellent technical aptitude when motivated and none otherwise and this is clearly a situation of motivation.