With the same bon ton pretty obvious is that all opera data accounts can't be managed on a single vault. All users around the world to sync bookmarks stored for 'safe keeping' on some servers located in Sweden or Norway doesn't have any sense at all, can't be done. Cloud-based
services could be safe, far from Google I would say. I would bet on Facebook, not those who own, the ones who serve methinks. Depending on which side it is at a given moment as business solution Opera may have a vault to sell. Sound awkward but is the plain true and can be done playing smart. For me that's obvious.