From a school system email:
PowerSchool has informed us that they have taken action with the hackers to ensure the unauthorized data was deleted without any further replication or dissemination. They do not anticipate any of the data being shared or made public and are working with cybersecurity experts and law enforcement to ensure ongoing data safety. PowerSchool indicated they will be providing credit monitoring to affected adults and identity protection services to affected minors in accordance with regulatory obligations.
Reputable blackhat hackers often use an online portal where they show proof.
Lesser known ransomware gangs are definitely known to try and double dip though.
That’s why you should always check the reviews of any hacking organization before letting them hack you.