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Also, it seems Apple demoed Docker on Apple Silicon at WWDC:

I know they demoed Linux virtualization at WWDC, but I don't recall Docker. I could easily be mistaken though.

They specifically mentioned it by name in the keynote, and even have a screenshot of it running on Big Sur. https://www.youtube.com/watch?v=GEZhD3J89ZE&t=6006

(1:40:06) if the timestamp doesn't work

Yes, but it was ARM up and down, no x86 at all.