Your argument on this thread is incoherent. You begin by suggesting that GCM is problematic because it's a component of a larger platform library that gives Google control of Android phones. When it's pointed out that GCM push can be supported without that platform library, your argument shifts: it's the messages themselves that are dangerous. When it's pointed out to you that the messages are empty, you invent a scenario in which GCM push messages enable a kind of traffic analysis that on-the-wire traffic analysis can't already accomplish.
Were this my argument, rather than pointing me to a thread where my points were continually and reliably refuted, I'd take this opportunity to instead restate my argument clearly.
I think you're misinterpreting my arguments because it suits your preconceptions if that were the case. GCM is not just client code. I clarified when someone said the client could be replaced.
I have read this; I don't generally comment on issues I'm not informed on.
Moxie is simply wrong on many of these points, and has been for a while and has had this repeatedly pointed out with no change in opinion. I would rehash this here but you'd be better off simply reading the linked thread and looking at other rebuttals. In particular I remember a 500+ comment GitHub thread on the Play Services issue where Moxie was repeatedly dismissive and rude to those who take issue with the glaring security problems in Signal.
Were this my argument, rather than pointing me to a thread where my points were continually and reliably refuted, I'd take this opportunity to instead restate my argument clearly.