Can we really trust/rely on Internet Sorting Hat Simulators?

The Real Sorting Hat uses magic to determine the house. Online Sorting Hats use (hopefully truthful)answers to a quiz. Does taking a online quiz, even the ポッターモア quiz, really determine the right house? My friend says since harry got to choose his house he is allowed to rig/fix the 回答 to the クイズ so he can be in the house he wants. what do あなた think?