Most often, these links lead to "verification" scams or malicious software designed to compromise your device.
The original Forza Horizon 3 installation is roughly on PC. Any "APK" claiming to be the full game that is only a few hundred megabytes or even a couple of gigabytes is a red flag. Downloading these files can lead to: forza horizon 3 android apk obb download upd link
Some sites provide APKs that are simply wrappers for cloud streaming services, which lead to the next point. How to Actually Play Forza Horizon 3 on Mobile Most often, these links lead to "verification" scams
A puzzle-based car restoration game officially under the Forza brand. forza horizon 3 android apk obb download upd link