Hi Max,
according to the Fairphone forum users the FP3 does not have an FM radio, although the Qualcomm SoC should have hardware for it - it may have been explicitly disabled or removed. I confirmed that the kernel (via the radio-iris driver) does not produce any messages in the dmesg output. I suggest we remove all userspace system and vendor FM libraries as well as the FM radio system app as a consequence.
I have gone ahead and pushed the corresponding changes into my repo.
BR,
Daniel