Few comments here that id like feedback from somebody, if possible :

• fairphone does not sell mainboards seperately because things like the phone imei is linked to it, which in itself is often linked to the mobile provider. Changing this isnt always allowed, depending on the country/state/whatever
• afaik they do still order from china oems, but i think they choose parts that are certified to not be made with childlabor, unethical stuff etc etc. If it is like that, nobody knows. Thats the problem with the whole fight against unethical stuff