Originally Posted by
Hitei
Forced to temporarily halt all development or network usage until the issue is fully resolved (i.e. no one can work but everyone is still being paid). Forced to probably completely switch or thoroughly restructure network and probably file systems to prevent any additional intrusion. Significant legal feels attempting to identify and seek damages from the third party. It "includes" the leaked footage, which means there's probably plenty of other things that were compromised--private information, financial information, etc. that they now have to pay to ensure the security or transfer to an uncompromised position for. Security regulations like GDPR might issue actual fines (in tens of millions) for any data or privacy loss.
If any of the actual game's structure was leaked, portions of that might also need to be re-written to prevent ease of exploitation on release. Any company that has any sort of security breach sees a dip afterwords, reduced confidence from investors and other non-consumer associations (because companies are hesitant to work with a company that is a liability). Early, janky in-dev footage may turn off some potential buyers (lol @ iT's 25 dOLlArS) and otherwise generates negative press they now have to spend even more marketing budget on, as well as making marketing's job more difficult to begin with because they're no longer ahead of the curve.
So, a lot.