other8026 I wanted to test it, but as it's only visible for apps that are known to need it and I don't know what those apps are, I can't do it, I can only comment that I get the same result as @Watermelon for apps downloaded via Sandboxed Google Play, I don't think I quite understand it either.
For DLC via memory :
Default (Restricted)
Restricted
Allowed
And for DLC via storage :
Default (Allowed)
Restricted
Allowed
I use Sandboxed Google Play in Private Space and I didn't modify anything. Sometimes, I've simply deactivated DLC via storage or memory even if the application requests it to see if it can run without it, sometimes it works, sometimes not.