on the other hand, the ransomware groups that want to stay in business need to be honest (with respect to not releasing/deleting data) or they wont be 'credible' ransomware operators, which is kind of funny to think about. and in many cases, the victims would rather the ransomware operator be paid (so their data is not leaked) vs. having their data leaked. so paying is the best for current victims (but increases the potential for future victims).
the dynamics/economics around ransomware is fascinating.