How is this kind of "growth hack" not simply dumping[1]? The only new development here is that dumping is no longer limited to large companies with large war chests thanks to the availability of venture capital.
The more interesting question is can healthy, truly profitable technology companies develop in an environment where they have to compete with startups that are ready and willing to undercut them by losing tons of investor money. I don't think the current status quo is good for the long term health of the valley.