Bug bounty programs typically have stringent rules, disqualify many valid reports, and take a long time to pay out. Not surprising to me that they'd cash out in this manner - especially if they got access via a token which expires: they wouldn't have much time to plot on how to monetize the access.
I suspect this was a small operation - a national intelligence organization could have caused orders of magnitude more havoc with this sort of access. Smaller groups don't have the infrastructure to capitalize on such chaos.