Just happened that Tensor was the only SoC which supports/supported the features they defined as minimum requirements for GOS, see https://grapheneos.org/faq#future-devices .
The coming GOS-compatible phone from Motorola will use a Snapdragon, iirc.
If Google was laughing I don't think they'll keep laughing as things develop from here. Stone soup is the nature of these ecosystems, if being a graphene selected vendor gives Motorola a leg up (or back?) what will another vendor do when copying a success? Google could try to take their toys and go home by breaking the API but then certain sectors will require an iPhone for legal requirements.
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