Hello !
At first, we are very happy to participate to this operation. Unbox Now goal is to bring new players to the hobby and to BGA using the games we love the most, and this is a great part of our mission!
The BGA benefit you get from the Unbox now code may be different from a game to another, and from a time to another, and even from a player to another, because all Unbox Now games are not on BGA and because we are testing different things to make sure this will be a great success (+ and opportunity for you to get access for free to these games).
As a rule of thumb, if the game is available as Premium game on BGA, you will get a free access to this game, even if you are not Premium, for a given period (ex: 6 months, 1 year...). If the game is not available on BGA, you will get a Premium free trial.
Obviously ou plan is to have all these games on BGA at some point in the future, even if we cannot guarantee this at 100%. But what you can keep in mind is that the final goal would be that when you buy a physical board game, you are able to access it on BGA for some time, even if you are not Premium.
It is worth noticing that if this method is successful we would offer to all publishers with games on BGA the same thing, because if it makes sense for Asmodee it makes probably sense for all game publishers.
To conclude: we are testing different things to bring new players to the hobby, and to bring these new players to BGA. BGA cannot exists without physical board games, it is BGA core mission to support physical board games, so this is an attempt to do another step in this direction
