Really cool idea. It would be awesome if you could crowdsource the data for any companies through employees - some big companies don't have much transparency on revenue numbers, but employees in various positions could piece that information together through this service. Maybe even the rare private company that offers their revenue information willingly.
Reliable data on revenue of private companies would be very useful to employees/investors in determining the actual value of the company's equity.
Yeah I'm sure a company like Buffer could be willing to share that information (like they already do for their revenue on the Baremetrics "open startups" page)
I agree employees (and past employees) could offer valuable information, although they're probably legally bound by some confidentiality agreements...
However I think when you're in a market it's easier to estimate how your competitors are doing, even though you don't have any privileged info.
Reliable data on revenue of private companies would be very useful to employees/investors in determining the actual value of the company's equity.