Are you saying the injustice is that some people can afford to bail out and some cannot? Or is the injustice that the bail concept exists in the first place?

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.