ARM shipped it as a standard feature of Cortex cores significantly after it was added as an ISA extension. MediaTek and Exynos provide it and Snapdragon is approaching shipping an implementation.

Google set it up for usage on Pixels, and then later Samsung and others did too. Pixel 8 was the first device where it was actually usable and production quality. GrapheneOS began using it in production nearly immediately after it launched on the Pixel 8.