I actually used Doom as an example of software that has received a great (it might be even the greatest) community help. However, this comment (https://news.yco

I actually used Doom as an example of software that has received a great (it might be even the greatest) community help. However, this comment (https://news.ycombinator.com/item?id=25622021 https://news.ycombinator.com/item?id=25622021) has succintly described further the issues of open-sourcing a previously closed-sourced software. One of the most important point here is the fact that some software code are not organized could have a surprise third-party code which required intensive audits. Obivously, in some cases it is simply not economical to do such auditing.