Bail is designed to prevent flight risk. It is set high enough that you'd have a hard time coming up with that much money without being forced to stay and appear. Having strangers pay your bail means you have no reason to stay. It makes bail jumping more likely. People having a hard time making bail is working-as-intended. It may be hard to swallow, but the system was purposefully designed this way. If you dislike it, write to your senator. Paying others' bail, even as inefficiently as this, will change nothing.
Very very inefficiently, actually. Mining on "unused cycles" on most PCs will generate negligibly small amounts of money. Even multiplied by the number of people foolish enough to enrol in this, it will still be a negligible amount of money. So who decides 1/10th of which criminal's bail this will go to?