What "Add to Home Screen" means — none of these are App Store apps. They're web pages.
Tap Share → Add to Home Screen on any of them and iOS drops an icon on your phone that
opens full screen with no browser bar. That's how the Trosky icons got on your home screen.
🔴 Right now that's broken on most of them. Only 5 apps actually ship an icon —
the rest hand iOS a grey screenshot instead. Fixing that is one small job per app.