It's an honest question. I can't think of any. But for all I know, immigration to some Andorra/Albania/whatever has been significantly higher than emigration every year for the past ten. I can't recall reading anything with data and I'd like to know.
Our economies are built on the assumption of endless growth. Those immigrants better have children above the replacement rate.
So, I don't know how immigration works on your planet, but here in the real world immigrants do not get free "feeding, housing" or free anything-else. In fact a key condition in even the most open/lenient countries is that you must show proof that you can provide for yourself. Any other way would simply not make any sense, and I am always in awe at the level of confabulation needed to believe these nativist fairy tales.
Or maybe you're one of these people who mistake immigrants for refugees?