I find it weird seeing Sony at the top of mobile charts, because they definitely don't come to mind as having a large presence in mobile apps. Is it mostly applications rather than games? Are they mostly japan only releases?
It's from their Sony Music department. The different departments at Sony often work very separately from each other, sometimes even competing against each other. The Playstation division has nothing to do with this.
"The strong do what they can and the weak suffer what they must" - Thoukydides