I'm going to take a slightly controversial position here - so please read through my logic before you downvote me into oblivion. If you read the article, you'll see that what's happening at Zynga is not "Taking Back" stock, instead it's talking about _future_ compensation. Every time I've been through a Compensation Review - one item that is made very clear to my manager, is how much _unvested_ stock I have in the co…
I have to respectfully disagree with your logic. If you read the article, what is actually happening is they are retroactively trying to reduce restricted stock grants that were already made . So, if I say "come work for me for free, and in exchange I will give you 10,000 RSU that vest over 4 years", then 3 years down the line say "just kidding, you don't get these last 2,500, but you get to keep working here", that…
If it's ethical to fire these people (in which case they lose all unvested shares) then it stands to reason it would be ethical to renegotiate a deal that both parties think is fair.