They removed a rarely used function from the free android open source project to a paid, closed source program that Samsung/Xiaomi/OnePlus/Sony/etc are already paying.
This affects only who uses Amazon or Huawei devices (or a Google-less custom ROM)
But while nobody cares about this specific function, Google is slowly removing features from the open source project year by year. The calculator, the calendar, the email client, and so on
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.