It looks to me like they're designed to help the accused, not the criminal. Here's a great infographic about the problem: http://www.pretrial.org/the-problem/
It's not that clear from the information presented though.
I also assume that they intend to be presented as an alternative to a prison sentence, if the judge is so persuaded. Just having a track record of compliance with Promise before any sentencing happens would probably be quite helpful.
I think this is one of the neater startups I've seen. However, privatized jails/prisons seem to be rife with abuse... privatizing parole seems like it would suffer the same temptations.