That's not so much of a problem - in the long run Oculus was going to have to become profitable in some way or another, most likely by selling consumer hardware

That's not so much of a problem - in the long run Oculus was going to have to become profitable in some way or another, most likely by selling consumer hardware at a profit. The narratives people get afraid of are of Facebook trying to get profit through the methods of a free website: selling advertising and user data. Given that this is a hardware product, and especially since it's one that will not yet be commoditized when Oculus releases it, I don't see this being a real problem; Apple doesn't need to sell ads or snoop your data to make enormous profits on the iPhone, for example. To extend the smartphone analogy - I think it's more likely that when there's a popular competitor trying to undercut Oculus on price, someone is going to start trying to sell advertising or user data to pad their margins, but I think that's a pressure that exists independently of Facebook ownership.