It's quite a stretch to say he had stolen the entire network. In fact, it's absolutely false. They could have done a hard admin reset on the routers and affected systems and been back in complete control of them. They chose not to, for various legitimate reasons, but the network remained in the possession of the legitimate owners.
Using the door analogy, what if he was a custodian, changed all the locks, kept all the keys, refused to give them to the owners? Sure they could hire a locksmith to change all the locks, but why should they?
For suggesting that a measure of tidal power could be harvested as well here? After all, kites can be used to harvest power through the tension exerted on their cables, if I'm correct. Similarly, these turbines are going to be tethered, right? How about it?
Kites harvest power with keys tied to their strings, not tension.
plenty of european and japanese cars already feature such a device.
Some American cars have had "instant fuel economy" readouts as an option for many years. I know the 1992 Lincoln Town car had this as an option. Of course it still got 12 miles per gallon, but at least you knew about it.
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Beware of the Turing Tar-pit in which everything is possible but nothing of interest is easy.