FiveM is primarily about immersion. In RP servers, using an external cheat to see where police are hiding or to auto-win gunfights destroys the narrative for 31 other players. It shifts you from a player to a "griefer," often leading to community blacklists that span across multiple servers.
Check out C++ External ESP tutorials or explore FiveM Lua Cheatsheets to see how server-side scripts handle data. fivem external cheat