Nobody is suggesting Fairphone has also replaced Google/Android re SW/OS. What they've arguably done I'd improve the existing situation - surely that counts for something?

There is also nothing precluding them from dropping Android in the future and putting effort into something like Sailfish OS.

You can run postmarketOS on it, although some features are not supported yet: https://wiki.postmarketos.org/wiki/Fairphone_(Gen._6)_(fairp...