"Someone named Dragondude joined the ESF team as a mapper. He then made the jump to coder and gained access to ESF’s source code. He handed the code over to his friend Kurt, who compiled the code and released it onto the internet. Kurt also managed to get a hold of and release the forum with all hidden sections viewable, including the developer and admin section. Everyone associated with the leak was banned from the forum.
The leaked build showed a buggy game that wasn’t anywhere close to being complete. Moral on the team was low, and the leaked build could have very well killed the mod. Instead, the opposite happened. The team decided that too much work had been put into ESF to simply give up, and a renewed effort was made on completing 1.3.
The ESF team opted to do open betas, releasing periodic builds of the development version to the public. Harsens, the lead coder of ESF at the time, described the open beta as follows:
"It might be unbalanced, buggy and contains some console commands to make testing easier, that could be considered hacks. If you want to play competitively at a stable server, this might not be the release for you. However, if you would like to take a look in our kitchen, you might want to check this out."