For example, I have a script that makes it so that when you double tap W your walk speed is changed to 30. (I can provide the script if you want but It works fine.) I use it in a FE game. The script in a local script in the player's backpack and accessed the humanoid with script.Parent.Parent.Character.Humanoid. Now, would the walk speed change only for me since character is descended from workspace? Would it not change at all since I should use a remote event? Or would it just update for everyone (a major security breach for my game.)
I'm just curious no need to give down votes
As I said I can provide the script but didn't see the need.

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If my local script (which doesn't have remote functions) automatically replaces to server won't this make speed hacking easy on FE, thus rendering FE useless to defend against the usual hackers