system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does the source code for CSGO and TF2 being leaked mean that servers may be unsafe to play on? Like, what does the source code allow people to do that they couldn't do before?
gpt
The source code being available means that everyone can see how the server operates. Which means people can see directly what vulnerabilities there may be rather than just guessing. It makes a hackers job easier, basically. 

The flip side of this is that having your code open sourced means that lots of good programmers and security experts can audit the code and recommend changes to the publisher. 

It’s a double-edged sword basically.