I would suggest to not speak nonsense on a development forum, it doesn't make you look good at all. This has absolutely nothing to do with sources being public. For that matter, the sources have been public for more than 10+ years on rAthena. Not only that, but C# is not a compiled language, it can be "decompiled" with little to no effort to begin with using tools like JetBrains. What's worse in what you said is that the encryption is applied via cps.dll, compiled in C++, which isn't released in the source at all. Even if someone didn't know the sources were public on rAthena, Act Editor has all the libraries in plain sight outside of the executable to begin with.
For reference (because I've heard that comment many times already):