I'm not sure if Justin has an access to all steem keys. I don't think this is how it works @thehive. You cannot get an access to everyones wallet only because you're becoming largest stakeholder on the chain.
Surely changing password is good advice anyway :)
Cheers
Piotr
Steemit Inc has access unless you change them and use an alternative front end like you are doing with Steem peak, If you have not changed the original keys. Then Steemit Inc needs your keys.