Most welcome!
In my 4 years at WeMod, only two game developers have ever had an issue with trainers being used in single-player game modes. Unfortunately, Forza’s devs are one of them.
As someone who actually works in the game development industry, I can say that this is a false statement and purely one-sided speculation. 
As said above, only two developers in the last 4 years have had an issue with trainers being used in their games.
See my recent post here for more information: Denuvo to block cheats and mods in games - #5 by Ravenfyre.