There’s a difference between technicalities and practicalities.
Money has a known and accepted value.
Sony and/or PD would have to prove in court that virtual cars in a video game, that can be acquired by simply playing the game you have already paid for, have a real cash value before they could prove theft.
As far as I'm aware, there’s no precedent established (I may be wrong) for this, and if so, a test case would take ages (likely years) to come to court… Courts have more important things to deal with than this.
Civil (not criminal) courts are specifically for this kind of nonsense.
Like I said, I suspect it won't go ahead, but if it did, the more complex it was and the longer it took, the better in Sony\PDs eyes, as I suspect they have much deeper pockets for their legal team. Often in these kinds of cases, it doesn't matter who is right, as it can be made so expensive, that it's easier and cheaper for the average person to not bother to fight, even if they've genuinely been wronged.