They could have sold this to a ransomare group or affiliate for 5-6 figures and then the ransomware group could have exfil'd the data and attempted to extort the company for millions.

Then if they didnt pay and the ransomware group leaked the info to the public, they'd likely have to spend millions on lawsuits and fines anyways.

They should have paid this dude 5-6 figures for this find. It's scenarios like this that lead people to sell these vulns on the gray/black market instead of traditional bug bounty whitehat routes.