So I've been looking through their supplier list:
https://www.fairphone.com/wp-content/uploads/2019/09/FP3_Lis...
In what way would you consider this superior to Apple's corresponding record?
https://www.apple.com/supplier-responsibility/pdf/Apple_SR_2...
To my eyes, Apple actually has (or at least claims to have) better auditing of their supply chain. In particular, for Cobalt, one particularly concerning conflict mineral, Apple has over the last couple of years established complete auditing, while Fairphone is not even reporting numbers for that mineral yet.
To be sure, they did not do that out of the kindness of their hearts (particularly not in the Steve Jobs era). Pressure from NGOs and maybe also competitors like Fairphone helped.
[Disclaimer: I work for Apple, but don't speak for them, nor do I have firsthand knowledge of their supply chain]