While I highly doubt that MFC would record members' video streams, I suppose it's possible that they grab random captures for the sole purpose of having documentation in case there's a complaint of anything inappropriate (or illegal), just as they do with models' cams.
I don't know if they even do this, but if they did, someone would have to compromise that database (if it even exists!), and then, as others have said, compromise another separate, secure database with customer information and then match the 2. And how many guys might not even care if those pics got out?
Sounds like it'd be too much work, and maybe even a wild goose chase. There are far more lucrative options available to fraudsters than extorting MFC members.
So yeah, it's possible, but seems even less likely than winning those multi-millions in the lottery.