What benefit is it to the ransomware group to release the data? They may be sloppy or careless with their data (like their victims) but I don't see a for-profit

What benefit is it to the ransomware group to release the data? They may be sloppy or careless with their data (like their victims) but I don't see a for-profit/non-ideological ransom group reneging and intentionally leaking the data. And plenty of reasons eg repeat actors to do their best not to. Actually I'm often surprised that many ransomers/hostage-takers go through with their threats when they don't get their demands. The only reason I can see them doing it is if reputation matters to them for future negotiations. more than the risks from the greater liabilities they incur by going through with the threats.