You absolutely have a point there.
But still, for Zuckerberg to openly screw a YC backed company would be to screw YC as well.
And I find that hard to believe.
Doesn't mean that it is impossible, just implausible.
Zuckerberg's moral compass is set on "WIN."
All the other 'zucks' notwithstanding there has yet to be a clear cut case of fraud to come out of all this and I can't imagine YC et al would stand by idly if this happened to one of their investments.