Apple doesn't have any accommodation for this. I suspect the problem would be was somebody really setting up an account for a true person with these needs, or was somebody gaming the system to get away with something else? How much trouble are both parties willing to put up with policing this?
Have you looked into setting parental controls/Screen Time? Would those be adequate? Read about how to use Screen Time on an iPhone, iPad, or iPod touch, in this Support article --> Use Screen Time on your iPhone or iPad - Apple Support
With Content & Privacy Restrictions in Screen Time, you can block or limit specific apps and features. Details are provided in the article: "Use parental controls on your child's iPhone, iPad, and iPod touch" —> Use parental controls on your child's iPhone or iPad - Apple Support
Set up parental controls with Family Sharing on iPhone --> Set up parental controls with Family Sharing on iPhone - Apple Support
I suggest you contact Apple and ask them if they have suggestions. I can think of ways, but they would be violating the terms of use so there's no point in posting them.
Refer to this page for Apple Support features ➔ Contact - Official Apple Support
Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.
This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple for support and service - Apple Support