Life in third-world country is complicated, mate. If I could go back to when I was 12 or 13 and some people offered me 10-20 USD for a couple of hours sitting in a coffee, doing some non-against the law light work, I would have said agree without any hesitation (yes you may say I would be promoting some scam ICOs but like I said people born in poor couldn't care that much).

In developed countries, jobless people even may get subsidy from government and have some kind of "traveling" to developing countries but on the contrary, there's nothing like "unemployment benefit" in those you called Tier 3 countries. Children in developing countries have tendency to earn & save money since early ages. I would say I disagree using children for any laboring purposes but in some cases, if it is fair (win-win) situation, everything should be acceptable.