Games don't really use those technologies because we want to use the same tech on Android and Apple so we typically roll our own or pay a third party BaaS. The big players probably almost always roll there own.
Sure, but until apple makes an official way to provide binary dynamic libraries on demand without breaking the app store rules, which would probably be delivered through something like binary on demand resources, the big game players cant do it either. Whatever official version apple makes will probably update in the background better too, since they have full OS control, unlike ad hoc apps.