Your Ubisoft account can be suspended and subsequently permanently deleted for 'inactivity,' taking your games library with it
www.pcgamer.com
Direct from the horse's mouth: https://www.ubisoft.com/en-us/help/account/article/closure-of-inactive-ubisoft-accounts/000079595
Edit: The Ubisoft page linked here has almost completely changed in the last day.
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