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One thing in the story is that the SPU - the secure enclave on Qualcomm chips that is separate from just running on TrustZone on the main processor - is only available on Snapdragon 8 and X tier products. It's market segmented away from 7 series and below.

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Also, I think Qualcomm has only started supporting MTE on Snapdragon 8 Elite Gen 5. Older and cheaper SoCs do not support it yet. Outside that, I think only Google Tensor, recent Exynos generations, and Apple A-series support MTE (though IIRC Apple has an improved extension of it).

Snapdragon 8 Elite Gen 5 has at support for MTE. It doesn't yet support running the whole kernel and userspace with it in practice as GrapheneOS requires but we're going to be working on it with Motorola and Qualcomm.

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