“Jailbroken” is a bit of an exaggeration. It is just a mod for the editor.

They didn’t put any technical hurdles in place to break out of in order to remove the restrictions. They used .NET which is easy to decompile and patch, as seen with all the unity mods out there. They could have used obfuscation, which would hinder the effort a bit, but didn’t.

“Jailbroken” is also the wrong word, their is no jail, when we already have full permissions to change whatever file we want.