"this post is from an account that no longer exists" appears on which accounts that have committed which violations?

Which accounts commit these violations will show this?

A few minutes ago, it said this post belonged to an account that had been suspended.

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DeWayfarer · 61-69, M

Usually it's banned accounts. Yet likely that post was the reason it was banned. Basically the last straw.

This covers acceptable behavior on this site:

https://similarworlds.com/help/47-What-is-the-acceptable-behavior-on-Similar-Worlds

Yet it could be a violation of the TOS:

https://similarworlds.com/legal/terms