Any video will do. I hear having an open powerpoint presentation will also keep a device awake. Presumably Microsoft office is a mandatory install on such dystopian environments.
At my previous job, they locked down music streaming services like Spotify and Pandora because the company wanted to save bandwidth at the office.
But they didn't lock out YouTube, because sometimes YouTube had a business purpose. So people just switched to YouTube for listening to music, which used even more bandwidth. In protest of the ridiculousness of the no-music-streaming policy, some people even forced their YouTube to stream in 4K even when they had a 1080p monitor.
The blocking of music streaming was lifted within a couple months.