Re: Zynga has no USP...
Wrong problem. I'm familiar with all the accusations you've made. Back when I was playing their games on FB, they made no difference to me. I doubt they would now if I were still playing. Just before I quit playing I had finally cleanup my own finances enough that I was willing to cough up $25 a month to purchase some in game stuff. (I'd also figured out a way I figured my CC info was safe enough when I made the purchase.) So I ought to be exactly the sort of prime customer they are looking for.
So why did I quit? Two reasons:
1. Their server lag got to the point the game was simply unplayable. I'd log in and it would be five minutes before the playing field would display. As I'd be working along on something the server would suddenly reset. And I'd be back to the five minute wait while it loads bit.
2. Instead of letting the focus be on playing the game, it became farming friends to sell you things. Only, once you farmed yourself more than 35 friends playing the game, you discovered you couldn't send stuff to ALL of them, only 35 of them. Also a fair number of the rewards depended on visiting friends farms. That five minute wait listed above? Yeah, it happened each time you visited a friend's farm.
I've used Farmville here as an example, but the rest of their games had similar issues, except for Mafia and Vampire Wars where you didn't visit other people's playing fields, but the rest of the issues were still there.
My retired mother still plays. But they're never going to make a dime off her.