There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

adora ,

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.

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