Erasing apps from iCloud entails eradicating them out of your iCloud account, making them inaccessible throughout all of your units. This may be helpful for decluttering your system’s storage, eradicating unused apps, or resolving app-related points.
Whereas deleting apps out of your system solely removes them domestically, erasing them from iCloud ensures they’re eliminated out of your account completely. This prevents them from reappearing in your units in case you restore from an iCloud backup.