Not exactly. Electricity aside, servers also require maintenance. That requires server admins. Those don't come cheap.
Edit: also network costs. With the requirement of handling high user numbers at stupidly low latency levels, they'll need a seperate internet connection from corp and the data service will also not be cheap.
If you think that the goal of anti piracy measures is to be an impenetrable barrier, you've completely misunderstood the assignment.
The idea isn't to be literally impossible, but to be so hard to do that even the moderate tech heads won't bother.
The likes of Nintendo don't care if 12 people are pirating their games, what they want to prevent is situations line the PlayStation Portable, where almost everyone was cracking that fucker wide open and there was a shit ton of piracy.
Keep an eye out for when they do beta tests of exams. You'll get the cert for dirt cheap if you pass - we're talking £50.
There are two catches. The first is that some of the materials won't be covered in the existing books - the point of these is to update the contents. They do tell you the basic tech that will be covered though. If you have a solid understanding of them, you'll be fine.
The second is that you will be waiting MONTHS to get your result. I believe they wait until the exam you tested goes hold before giving you the cert. Last time, I waited something stupid like 6 months.
Kinda. Publishers often found arcade difficulty spikes useful in home console games because it would mask how little content there was. Super Mario Bros could be beaten in an hour or two by most people if the lives system didn't send you all the way back to the beginning of the game when you ran out.
Kindle jailbreaking isn't strictly required, especially if all you want to do is sideload books. It's more about if you want homebrew, other customisation options or you just wanna get rid of ads without paying.
The airplane mode is because Amazon has a habit of updating the kindle without your permission.