For me this is a perfect solution.
I strive towards great use of my studio website for my player base.
Your game account manager can help me with that.
(All the big service site's like steam etc are great for lots of people.
The downside is that they grab the attention away from the developers "Studio website" as well.
Not when a studio is already successful, but lots of indie websites are "just" a picture of a game and a link to other services.)
For my studio, a part of the focus is to present the players with great quality and functionality on the studio website itself.
So the professional line between the big ones and the small one starts to disappear.
Saving game data is a huge part of what i'm trying to achieve.
So yes i am very interested in the game account manager.