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When I built an image last time there were several unused other images with just hashes as names and two unused volumes, also multiple cache files and other files in the user’s home directory in various subfolders.
It's very possible they weren't unused.
Docker builds their images out of layers, and all the layers are used during runtime!:
https://sweetcode.io/understanding-docker-image-layers/
The idea is that you can essentially change PARTS of an image, without rebuilding it entirely, which saves space and bandwidth.