One thing I would also add to my questions above is: Where would company X want to be strategically in? Is it easier to acquire you than build it in-house? That's not necessarily a good enough reason to start something but can be proxy for who might be interested.

It's not a problem for such big guys as Google or Facebook to create clons of lots of startups. But they usually buy them. Probably because they find them promising or competitory. I guess they are intending to monopolize the market