Which benefited the carrier, AT&T, not the provider Apple, who could have sold a shipload more units if they were available on all carriers.
In the case of HBO Now, the roles of provider and carrier are reversed with Apple carrying the product provided by HBO. But, it is still the carrier benefiting at the expense of the provider.
Yeah. That worked so well for Google+.
They could have initially sold a crap ton more iPhones, but by forcing customers to go to one provider, it was a bigger deal when released to the rest of the providers. It was free publicity.
As far as google+ goes, you read my whole statement towards that, about it beings risky but if you have the appropriate audience it pays out.
Apple is doing now what they have in the past, except this time they are the ones selling the product instead of having their product be sold. I think you are missing the entire point to their marketing strategy that it is initially releasing on Apple, but will be available to other devices in the future.