Do they not even bother with variable names at least? That's ridiculos then if you don't even have to rewrite old scripts. It's like almost zero protection from script hacks. Funny thing is, I've seen dev saying on official forums they've "fixed" scripting.
If you're playing on cracked server though, it might have have a custom anti-script anticheat that scans for variable names, but as long as you make your scripts yourself and never release them you shouldn't be caught.