Ok, so it looks from that like the Pi is there to act as a VPN endpoint of sorts to allow the operators to use the recruit’s Facebook account undetected by FB’s

Ok, so it looks from that like the Pi is there to act as a VPN endpoint of sorts to allow the operators to use the recruit’s Facebook account undetected by FB’s geolocation security. From which it would appear they then run some sort of high-volume affiliate marketing scam.