I can "hack" the chess.com code!


It's trivial to change things client-side. That isn't hacking site code.
Everyone who used a computer in school that wasn't properly locked down knew how to use inspect element....

If you look at the other tabs the OP has open you will see he was looking at "how to hack your rating" before he obviously gave up and decided to inspect the element.
Ctrl - Shift - I and change client-side code. I wish people would stop thinking that changing client-side code was "hacking" and they would learn that the data is stored in server-side databases (not saying that you don't understand it).