> They are "permitted" to access to Google Play Services because their work hardening Android currently benefits Google.

Very little in GrapheneOS has gone back upstream post-Copperhead.

> Once Google feels like there is sufficient stability and compatibility with hardened memory allocator and tagged memory (and when they can get Qualcomm to support it across their range), they will make harder, until impossible, for Graphene.

What are you talking about? Google doesn't use hardened_malloc, and they literally invented MTE.