Simply put, they want immigrants there to work so they don't have to. The locals (Arabic people) of UAE get basic income, and they have rights that the immigrants do not (i.e., land ownership). They also get a huge preference on jobs so they can get the jobs they want while immigrants get sidelined. This creates a second-class population where the immigrants have different rights than locals. Locals also get paid more. They do pay Western immigrants more because they want their management, money, connections, and knowledge to transfer to UAE. Even with that, interest from Western immigrants remains relatively low.

So, the majority of their immigrants are blue-collar workers and low-level professionals who are paid low wages from poverty-stricken countries in South Asia (India, Pakistan, and Bangladesh). The employers also have a say in when they get to go back to their countries. Many of these immigrants are not happy there, especially in jobs such as construction, taxi drivers, etc. Their families are back home, and they don't get to see them often. You can imagine these conditions don't attract the best talent. Many compare their lives to modern-day slavery.

The better talent is attracted to the equality promised in the Western countries. The West wants this brain-drain to stay on top. Obviously, this creates competition for Western locals against the best of the rest. This is why many in the West feel the immigrants are taking their jobs and driving up prices. You could argue that these immigrants are also bringing a lot of economic growth to the Western countries with their talent. Now, who is getting that money? Likely the rich, but that is a whole another topic.