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Not a fan of either, but Azure icons look like actual things: http://code.benco.io/icon-collection/azure-icons/

The AWS icons seem procedurally generated based on a hash of each concept's name.

Yeah, limiting yourself to minor variations of a 3x3x3 cube is pretty rough.

GCP shows you can have strong brand consistency (even a limited color palette) while still having decent illustrations [1].

I didn't expect this when I clicked on the comment thread, but yeah, GCP has the best icons and its design element is the secret hero of the story.