It is a massive problem, because the majority of countries in the world that need immigrants, don't want those immigrants to be as successful, or the gods forbid, more successful than they are. They want the immigrants to fill the job gaps, but also to "know their place" in the pecking order of society and stay at the bottom. It is a "cut off your nose to spite your face" mentality, and everyone suffers and ends up with more problems, less potential - and a lower quality of life.
It's a horrifying situation.
Even in a civilized country like Finland, if this is how immigrants are viewed, the situation in other countries is deplorable. As you said, they don't want immigrants to become more successful or richer. If they succeed, it seems they'll do everything they can to prevent it with government support. Do you know the fear here? They think things will turn around when immigrants become very successful and rich. They feel they'll suffer the same injustices they do to immigrants. That's why they want them to remain weak and work in bad jobs. This is hypocritical!
It is going to get interesting in the next few decades, as many countries will have more close generational immigrants than "locals". What happens in the voting?