...it is heart-wrenching to hear Mo's story, and sadly human trafficking (in various forms) is still very common today. See the work of The A21 campaign ( www.a21.org/ ). I hope that Sir Mo is able to completely heal from his past.
@Namechangerxxx , I also want to address some misconceptions. As we know, most African countries do not have the "NHS" and "Social care" system that we enjoy here in the UK. Therefore, the support system is close family members or children sent to stay with elderly ones. When a child is "given" to you or asked to stay with you in an African context, it is a huge responsibility. You take care of that child as your own. In other words, you become the adopted parent(s) for as long as the child stays with you. You clothe the child, feed the child, send the child to school, and also send money to the child's parents or relatives for their upkeep and as savings/trust for the child's future. It is also common that when the child becomes an adult (or say turns 18), you set up a business venture for the child e.g. buy them a sewing machine, motorbike, etc. as a "leaving" present. Sadly, not everyone has a good heart so some of these children are maltreated and taken advantage of.
To put this in context, every child in the household is expected to help out to ensure things run smoothly in the house. Everyone (including the home-grown children) will have their share of chores. When I was about nine years old, my youngest sibling was a baby and it was my absolute pleasure to help my mum to wash the baby's cloth nappies, dry the clothes, and iron them. (Note there were no washing machines or vacuum cleaners so it's a lot of work around the house that both parents cannot do on their own without relying on their "grown" children for help.) I didn't see this as slavery in any form; rather it taught me to become a responsible adult. At Uni here in the UK, I know some of my mates that were so messy, that they could not even wash their bathrooms or keep their rooms clean.
...all I am saying is that we need to look at and understand the African context before coming to a conclusion. Not every child staying with a relative, or working on a farm, or cloth shop is a child slave. Without going into much detail, sometimes, it might be the only way for that child to survive, to eat, to live a good life, and avoid the bad things lurking around to harm that child. Bear in mind that some of the children are sent to relatives that live in the city so that they can end up, hopefully, living a better life. And like I mentioned earlier, sadly in our world today, not every one has good intentions to responsibly care for the child staying with them, but nonetheless there are still some genuine kind-hearted people that take very good care of the child/children staying with them as we can clearly see in Mo's story.