Twitter had a lot of side projects and people that were not needed to run their core business. E.g. they used to have a Linux kernel engineering team [1]. They argued their value, but I was always a tad skeptical. Even if they earned their keep in terms of ROI, Twitter can definitely be run without kernel engineers.

[1] https://danluu.com/in-house/

Ok now do the other 5990 employees.