I absolutely understand why people would feel safer using these, but I wonder if they would also feel unsafe about the potential for being hacked at home on a laptop or whenever they pull their phone out of their bag (it does have to leave the bag occasionally, right?)

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Pardon me for being extremely naive, but if someone like me starts using one of these (slim chance, but I'm going with it!), does that mean I need cages for all of my electronic devices at all times? I know the technology supposedly exists for reading brainwaves, so does that mean I literally need a tin-foil hat as well, and for what reason exactly?
This is coming from someone who likes the idea of using a VPN on unsecured or untrustworthy networks, by the way, even though I know with 100% certainty that they harvest and sell your data to other companies and make a killing on it. I'm all for that extra level of protection against thieves, but we're living in a world where the corporations who we rely on are already deep into our devices and personal lives... so I don't understand how a Faraday cage solves this riddle.
Also, this kind of reminds me of all the criminals on the dark web who inevitably get caught -- they're not being spotted via TOR's encryption; it's those times when they're just checking their email at the library on the regular internet and someone very intelligent notices some patterns. So again, the analogy of 'does it have to come out of the bag when you make a call'? kind of makes it sound like it's just a scam all around. But I'm very open to being proven wrong.