Delete Apps in the Cloud
How do I delete apps that I have removed from my phone but still exist in the Cloud taking up storage space?
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Apps cannot be stored in iCloud and do not take up any of your storage space. If you re-download a deleted app, it comes from the App Store, not from iCloud. The cloud icon in the App Store only indicates that it is a previously downloaded app that you can download again.
Also note that you cannot delete purchase history but you can hide it. Hide purchases from the App Store - Apple Support