Librem seems as bad as a typical Android OEM. Maybe I'm looking at the wrong repository, but the barely seem to update driver firmware?
https://source.puri.sm/Librem5/fw/firmware-librem5-nonfree
https://source.puri.sm/Librem5/arm-trusted-firmware
I hope I'm looking in the wrong place.
Purism don't really control the firmware of their modem and WiFi: the vendors do. However, Librem 5 has replaceable modem and WiFi card allowing to choose a different vendor. They did it for WiFi. A new modem is also being discussed, too.