Also both Amazon and Huawei never used the AOSP Fast Pair. Huawei has their own proprietary implementation which was there before even Google came up with Fast Pair and FireOS is still on Android 11.
One thing to note is they are still using ASML's DUV Scanner which doesn't have any restriction currently. But starting in 2024 they can no longer can export any. But still this is an remarkable achievement.
Also both Amazon and Huawei never used the AOSP Fast Pair. Huawei has their own proprietary implementation which was there before even Google came up with Fast Pair and FireOS is still on Android 11.