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Mistakes that are published could exist for extended periods(no expiration) as draft submissions (as long as there is one published version of the form that exists previous submissions will be available).
Once there is enough volume of submissions it will be difficult to monitor the state of submissions being sent to Unity. A lack of quality information coming into the Unity system.
Design
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Update (This is where the option should live if the Allow edit draft submissions is enabled)
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This should re-use the Keep open for but would be
Expire draft submission after for the placeholder text
The submit button will not allow the form to be submitted and will have a banner message display:
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