A good product opportunity isn’t always a good business opportunity.
Someone certainly could challenge Glassdoor on the product front, but as other commenters have noted, they’d be pitted against a well-entrenched incumbent, prone to legal challenges, and stuck with a convoluted business model.
Looks great! I built a similar system a few years ago as a dashboard for a home weather station, and ended up using Joan Home devices instead of assembling the hardware from components. Highly recommend e-ink as a format for these sorts of low-key displays around the home.
Someone certainly could challenge Glassdoor on the product front, but as other commenters have noted, they’d be pitted against a well-entrenched incumbent, prone to legal challenges, and stuck with a convoluted business model.