Icon packs are in a tricky legal gray area. Almost all of them (if not all) contain trademarked images legally owned by the original developers, and to make matters worse, many icon packs are paid. One developer recently submitted a new icon pack to the Play Store, only to have it rejected for “content owned by a third party.”
The developer in question is Saurabh Gupta, who attempted to submit ‘Android O Icon Pack‘ a few days ago.
Google rejected an icon pack for “content owned by a third party” was written by the awesome team at Android Police.