Seems like quite a bit of hardware engineering went into the design.
But if you are hacker and don't care too much about the aesthetics you could probably get 90% of the functionality with an ESP32, a GPIO extender, an LED array, an OLED display and a 3D printed case for like $30.
A few years ago, I built a simpler version of that device myself.
As you said: A 90% solution is easy to hack together. I had mine displaying Skype for Business status so my colleagues would know if I was in a call or just listening to music.
The harder part or much rather the time consuming part is getting a good status message from the installed apps. It looks like there is plenty of software and APIs available.
The Ulanzi TC001 devices are kind of near (without the double screen and all the buttons and stuff) for around $50. IIRC they have an ESP32 and have at least 1 or 2 alternative opensource firmwares.
1x some acrylic to laser-cut a case in a makerspace $5
So $24 total. The screen would be much larger than the Busy Bar version, which could be a pro or a con, depending on what you want.
If you need the smaller back screen (I don’t see the use because I would control it from a computer anyways), that would add another $3 or so. The buttons are basically free but if we assume $3, that’s $30 like you said in total.
Who’s doing the case? Who’s doing the buttons? Who’s gonna put it together? Testing? Programming? Flashing?
How about handling returns?
Packaging? Design for all of the above?
Well that’s the point of a DIY project, you are going to do it (if that’s the kind of project you want). I wasn’t saying you should build this thing yourself because the busy bar is bad, I was just giving some more data to the original commenter who said you can build something similar yourself for much cheaper.
But if you are hacker and don't care too much about the aesthetics you could probably get 90% of the functionality with an ESP32, a GPIO extender, an LED array, an OLED display and a 3D printed case for like $30.