More interesting context: both David Pecker and AMI have cooperation deals with Mueller, and have admitted to killing stories about Trump during the election.
https://attorneyalexhernandez.com/read-david-pecker-ami-plea...
Get the prison cell ready.
But we don't know who Mueller's selfie was of. (there was a claim it was some random who was sexting Guccifer 2 but that doesn't seem like something worth filing)
Maybe the better question is how or from whom he obtained it.
Manafort or Cohen seem most likely sources as Mueller's got all their stuff or maybe the AMI handed it over as part of their cooperation deal.
It's all a little weird as attempting to extort Bezos right now seems insane given the legal peril they are in. This may be worse than their part in election contribution violation they were previously on the hook for.