Well, there is no explanation, just several occurrences of saying it's not possible.
We know why it's not possible on app.
We can imagine potential technical difficulties to make a different curated content for app and website.
But we have no explanations on why it is not possible at all- and apparently, not desired by Tapas (that around the same time, opened a mature section...). There is a huge inconsistency, and a transparency problem, that are so undeniable that we cannot just ignore them.