I don't have to watch videos on youtube, I just have to walk through my home town and look around: all males estimated age 20-40. And none of them looks like he was a doctor or engineer in his home country!
I see it with my own eyes, in my home town!
And via a friend who worked in construction of one of the new camps in my home town, I have seen it from inside before it opened: I have stayed worse in hotels in Thailand (for 200 Baht per night) and I stayed at a similar standard in hostels (in Sieam Reap or Taipei, for about 10 USD per night).
Said friend pointed out that the electrical hot plates in the kitchen now have time switches. Before, the administration wondered about unusually high electricity consumption, until they found out that the immigrants don't switch off the hot plate when they are done cooking (a cultural issue: in their home country they cook with wood or charcoal, which you just let burn out when you are done cooking).