When Apple initially started adding support for 3D Touch to apps on the Home screen in iOS 9, there were some that supported the feature, and some that didn’t. Then came iOS 10, where Apple attempted to make the feature more 'useful' for apps that didn't utilize 3D Touch in creative ways by adding the “Share This App” menu option to those apps.
Because a lot of people don’t need or want to share their apps, and because it feels like unnecessary clutter to even have this menu option there in the first place, a new free jailbreak tweak called NoSharePlz by Olxios&Nico is now available in Cydia to remove it once and for all.