When co-operating with people I want to be able to kill-switch my scripts if I'm scammed:
script = nil at top of the script
the modulescript may have to return a function though
uploaded to an alt account with no active places which is never used
So basically unless there's another asset exploit I'm safe right
For the most part.
If you, for whatever reason, parent something into the script and give the player a reference to it, they could easily get the script (blah.Parent.Parent = workspace).
But yeah, for all intents and purposes you should be fine.