No coercion. If you don't like the deal, you're free to avoid it.
The point is, this is a predatory act and it should not be misunderstood as 'fair' or 'ok'.
Doesn't YCombinator give pittance amount of capital for an equity stake in the companies it invests in, with the value proposition being largely in introductions to VCs/Angels and some strategic help? Are they coercive?