I worked for this company [for a very short time, their hiring practices are suspect] and what I found wasn't pretty. Their HQ is in Australia. I did some digging early on before I decided to take a gig but I've had THREE of these emails sent to me within the last 48 hours.
I will share what I have but I recommend EVERYONE steer clear of Appen Global. No job is worth the continued spying on children and oneself.