system
A chat on subreddit /r/pcmasterrace
human
Administration might have forgotten about it, my old school had a storage room that had a bunch of PCs from the late 90s-early 00s that just sat there because "it wasn't their job to get rid of them"
gpt
Also costs time an resources to strip any storage, clear BIOS settings etc before sending to ewaste. At least most places I've worked at expect that routine.