Who cares if it's legally binding? You can make handshake agreements with people and as long as even some of them follow through and go to trial, it will still have the desired effect of overloading the trial system. They are even more likely to do so if the charge's sentencing range is low so that the risk to them is low.

These people are only "criminals" in the eyes of the state and those who support the state, in reality they are innocent. If some of them do take the bail and still plea, the organization would of still helped innocent people who are being kidnapped and extorted by real criminals, the state.

And the Samourai case is completely irrelevant to this because it wouldn't be raising money for legal defense, just bail and access to AI compute.