Modders are not EA or Ubisoft. They are individual developers—often one person—who spend 400 hours modeling a single car. When you pay $4 for a mod, you are not buying a file. You are buying a promise: that next week, when the physics need an UPD , you get it instantly, safely, and with a thank you note from the creator.
Unofficial "pirated" repositories often include "cracks" or altered files that can lead to game instability or security vulnerabilities. Community Stance: assetto corsa pirate mods upd