After reading a thread on a gamedev subreddit, there came the topic of open source games. The person claimed that they are less secure than their counterparts with the source code that is closed. He said it was easier for people to see the inner workings of the server and exploit, compared to the black box approach of not knowing how the server works. This does not seem correct to me however. Open Arena seems to be ok and is open source. Also if a lot of logic is done on the server side, wouldn't it be just as hard to cheat?
Are open source multiplayer games less secure? What have I not considered?
Thank you, I am very curious about this topic.