Using third-party GUIs is against Roblox’s Terms of Service and can lead to several negative outcomes:
Allows players to instantly move between different worlds, such as the Haunted or Candy Islands, without using in-game cannons. The Risks of Using Custom Scripts Pet Simulator X (Ghost Pet GUI)
Most custom GUIs for Pet Simulator X include a suite of automation tools designed to speed up progression: Using third-party GUIs is against Roblox’s Terms of
Automatically directs pets to break chests, crates, and coins in specific areas without manual input. Pet Simulator X (Ghost Pet GUI)