Sold to him by white Europeans.
I hope you see the irony that you’re saying that the sheikh is a stereotypical Arab because he’s involved in slavery… something he’s being sold by white Europeans. With their history of 400 years of the slave trade.
If a stereotype is applied to everyone, it’s ceases to be a stereotype.
I think people understand now that modern slavery happens in sweatshops in your local city, cleaners trapped expensive townhouses and young women sold the promise of a better life. It’s universal, it’s happening round the corner from you and isn’t restricted to any creed or culture.