AFAIK Librem claims they use separate verified suppliers and builders (compared to more common Android manufacturers, for example). Kind of a zealot thing too though.

And PinePhone (original) at $200 is not that expensive if you think of it as a compact version of a Linux platform like Raspberry Pi. Raspberry Pi + charger + battery + touch display + 4G modem + GPS unit + microphone + speaker will probably run close to $200 too.