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Pros
Pro Shares user accounts with the dominant public registry, Docker Hub
Cons
Con No longer free
Rate limits on downloads can royally screw your deployments. In 2021, they will start deleting containers which haven't been pulled for six months. This will suck for stable software which doesn't get redeployed frequently.
Con Gives no metadata about image tags beyond their name
No information about when the image was created, pushed, what Dockerfile it came from, what user(s) pushed it, etc.
Con Poor user interface design
Con Default to public makes it dangerous
Since by default your account will create new repositories publicly, you could fairly easily leak sensitive images with one bad push.
Commonly Compared
Docker Hub
vs