HBO and Cinemax have had apps on the App Store for about a decade, serving up adult content the entire time, sometimes with prominent editorial placements. The answer is, as always, "app review is a crapshoot".
One thing I thought was interesting: Apple sells access to HBO & Cinemax through their TV app, but that access does not appear to include the adult content (or at least it does not display without an active subscription).
One thing I thought was interesting: Apple sells access to HBO & Cinemax through their TV app, but that access does not appear to include the adult content (or at least it does not display without an active subscription).