This should be legal. Copyright law does more harm than good.
The only ethical problem here is that only Meta sized companies can afford to pay the "damages" for such blatant law violations at worst, or the fees of their lawyers at best.
If an individual was the one tormenting almost 82 TB of copyrighted books, the damages they would have to pay would be in the trillions (mostly because of how broken the copyright law system is)
If only these corporations with vested interests in permissive copyright would put their money where their mouth is with lobbying for a change. Or is that only allowed when they're trying to do something scummy? I forget.
The only ethical problem here is that only Meta sized companies can afford to pay the "damages" for such blatant law violations at worst, or the fees of their lawyers at best.