iCloud requires an Apple-ID, and unfortunately, it’s not possible to delete an Apple-ID.
For more information (and a possible user suggested solution) see: https://accountkiller.com/en/delete-apple-id-account
URLS:
https://www.icloud.com/
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.