There are far more engineers burned by business guys stalling and not paying them then there are business guys burned by shady developers.
To put it another way, I am much more scared of a howitzer than of a derringer: there's very high profile and tragic cases of people being killed by derringers (Abraham Lincoln), but there are much more cases of people being killed by howitzers (that we don't even think twice of them).
This is completely irrelevant. Even Zuckerberg knows that he blatantly ripped them off and stalled them so he could execute it himself. Why else would he settle for ~$65M (Err, I should say ~$35M)? Then to add insult to injury, he misrepresents the value of the stock in the settlement.
I might be singing a different tune if he hadn't agreed to do the work for them.