I'd say they make it a priority to keep people from tampering with their code, and maybe maintaining the platform's integrity. They even ban people who use tweak on jailbroken iPhone/Android. I found these articles about avoid Snapchat detection a while ago, it's a cat and mouse game.

https://aeonlucid.com/Snapchat-detection-on-Android/

https://aeonlucid.com/Snapchat-detection-on-iOS/