The choice isn't just between rotting in jail and something like Promise, though. Many of us on this forum could pay bail and face neither. That's the fundamental injustice here, I think.
If the former, then what are we going to do about it? Enforced income equality programs have been quite disastrous in human history. If the latter, well, yes, it's a weird way to get around the fact that the state technically cannot be locking people up that aren't convicted of a crime yet. And for the poor, it very well may be that the choice is between jail and something like Promise.