Why is this a surprise? They treat their staff at all levels notoriously poorly. If your workers have no emotional investment in your company you shouldn't be shocked when they start doing subversive things.
The above comment indicates lack of surprise. Are you surprised unhappy workers will do illegal/immoral things, _even when the contract says otherwise_?
Expecting people who feel cheated or abused to behave accordingly is not a judgment over whether their feelings are accurate, fair, or their reactions are justified. It's just saying you aren't surprised.
The entire United States is founded on illegal activity. Many unicorns currently got to their state by illegal activity (ex.AirBnB,Uber). The police constantly break the law. There are so many laws that the government has failed to be able to count them, and it is estimated that everyone breaks several laws a day.
Why are you surprised that anyone would break the law? Especially when it's in their interest at the expense of an entity that harms them through it's own illegal actions
Edit:the illegal activity that the united states is founded on that I referenced would be the Revolutionary War and the activities leading up to it like the Boston Tea Party. It was not legal from the British government's laws which they we're bound to until achieving independence
...not to mention murdering Native Americans and taking their land. Surely that was illegal (not to mention immoral) from the Native American point of of view. I agree with your point that the entire US is founded on illegal activity. It's "might makes right" applied to the logical limit.