It can be done that way, but it is definitely not the norm. Businesses will generally “purchase” (many for €0) apps in ABM that are to be used for business purposes and push those to devices, the user can then use an Apple ID to download any other apps they want for personal use.

If they’re using Managed Apple IDs they will have no access at all to the app store and won’t be able to download their own apps anymore. IT department will have to buy and assign any apps that anyone needs, even the $0 ones that only 1 person needs.