Reverse engineering is not clearly illegal.
Most companies have a policy that says if you use our computers you consent to our monitoring.
What I would as a parent argue is that I can consent to my kid's monitoring. Hey, it's my kid. I can read their mail, but the federal law doesn't make any distinction. If I'm reading anybody's communications without their consent or without a consent of one party, I'm violating federal law.
I'd be very surprised if the FBI does not catch this guy.
If I am driving in France, I would be subject to French traffic laws. If I am driving in Australia, Australian traffic laws. If I am driving the information super highway, you don't know whose laws apply.
If you are a determined bad guy, you will find relatively easy ways to avoid detection. The good news is that most bad guys are not clever and not determined.
I would say the Fourth Amendment (guaranteeing protection against unreasonable searches) is the Fourth Amendment, and the fact that you're invading the privacy of millions as opposed to dozens should make it worse, not better.
I still get a little hungry around 10 or 11 at night, but now I try to eat more healthy snacks.
The bad guy will have gone through many, many steps to conceal his identity, through pirated or hacked accounts.