> That's not google being open though
Part of what makes Android "open" is that it's available to other hardware vendors to use.
> do you think they value their custom apps more than youtube access?
I don't know - Google seem pretty happy to put a YouTube app on the iPhone, where they have zero control over the App Store, and the reason is obvious: for everything they start, and eventually abandon, eyeballs are Google's primary business metric. Do you really think they'd deliberately cut themselves off from ~25% of all mobile customers worldwide?
Restricting the play store is one thing, I doubt it's even a drop in the bucket for Google profits, and it obviously gives them some degree of control.
I don't see them playing so fast and loose with the ability to view YouTube. It's like suggesting they would block access to Google search for non-Google "android" devices. The whole reason Android exists is to drive more eyeballs to Google services.