The moral issues with open source weapons--which is what jailbreaks should and need be considered--are myriad, as you empower increasingly weak and diverse adversaries the easier you make it to retool for different purposes. I appreciate that opinions on this matter differ; but I've struggled with these issues for well over a decade, and I still believe that "open sourcing" (which is an action that lies along a continuum) a jailbreak tool is are not ethical (and so am somewhat relieved to hear that this one isn't truly open source; though I fear that, given the authors, the parts kept closed source may be serving the wrong goal).