That's the whole point of hacking is to use something in a way unintended by its maker. That could be for something cool/interesting, or it could be for something nefarious. Nobody ever thought a coffee maker should run Doom, but they do. Not sure if there's a morality clause type of dis-qualifier for a Show HN, but there's a lot of people that would be interested in seeing how something benign was used for a different purpose. Especially if if saved them money/compute/time/resources/etc.
Yep. And "hackers" who apply that mindset to abusing publicly shared resources are why the rest of us are going to get DRM on our own, private coffee makers.
You skipped the step where the manufacturers make the physical item in your home a SaaS requiring wifi access and an account in order to enable all of the features advertised on the box.
Your comment makes it like all attempts at hacking are nefarious. Some are in direct response to the makers being assholes and attempting to extort more money from the same sale. You want to lump all hackers into the same box, yet I want to lump all manufacturers into the same evilCorp box.