At SpeedCurve we've built something similar for tracking and understanding the impact on website performance that third party requests can have. It's a big issue for websites when their user experience can be affected by resources that are not even under their control. We've seen websites where over 90% of the requests on a page are made to third parties.

Here's a dashboard showing third party usage for The Guardian over the last 30 days: https://speedcurve.com/demo/thirdparty/1/1/chrome/1/30/39tfn...

Great to see an open source list of domains linked to organizations. We've built our own list as well and we'll look at contributing them to this project.

(Disclaimer: I'm the founder of SpeedCurve)