Those method's are designed to manipulate website elements in a way that might deceive you or other users. Specifically, it modifies QR codes and buttons to redirect to different addresses, which is a common tactic used in online scams. Do not trust anyone that throws a line of Obfuscated Code !
Example of Scam PDF:
This is the line of code that you usually see out there, may have many other versions!
Stay safe and vigilant!