Acoustic analysis of keystrokes is nothing new to most of us.
Some of us are even familiar with acoustic cryptoanalysis[0].
However, combine these methods with this[1] tech, inspired on the work done here[2], and we have ourselves an impending crisis on our hands.
[0] Acoustic Cryptoanalysis - https://courses.csail.mit.edu/6.857/2014/files/23-shroff-hu-...
[1] Extracting Audio From Visual Information - https://news.mit.edu/2014/algorithm-recovers-speech-from-vib...
[2] Eularian Video Magnification - https://people.csail.mit.edu/mrub/papers/vidmag.pdf
Let's run through a scenario.
Your office orders pizza every Tuesday at the same time, via a coworker's cell phone. You are working on a technology that has the potential to disrupt several leading industries that are in bed with the government. After much lobbying, it is decided one day that your call to Domino's is to be rerouted via your broadband processor to an operative that mirrors your order to the real Domino's, and hand delivers the pizza at the front desk.
On their way out, they place a small, embedded, self-destructable camera device that focuses on your fancy new plexiglass installment. Over the next few weeks, the device documents all keystrokes and conversations from the front desk, and finds a way to socially engineer a copy of your codebase. Next year, seemingly out of nowhere, another venture suddenly launches ahead of your launch schedule, with your exact business model. All because you wanted some plexiglass and didn't think it was worth the money to actively scan the entire perimeter for bugs daily.
If this sounds crazy and far-fetched to anyone, then it would behoove them to look into past CIA infiltration techniques and also to realize that this is exactly the kind of stuff the CIA exists to do.