It is a big world my friend. And if millions come to use these services but don't pay in, the services get thinner and thinner. 1 Million Ukrainians came to German. Less than 25% have a job. The rest is financed by the taxpayer. Money, Rent, Health insurance...
Edit:
It reminds me of a Third Reich joke. An old woman goes into a map shop and looks at a globe.
She asks the sales person: What is this big blue land on the globe?
The sales person says: This is the USA.
Old lady: And this huge Red area, what is this?
The sales person says: This is the Soviet Union.
Old lady: And this tiny brown spot, what is this?
The sales person says: This is our Third Reich.
Old lady: Does the Fuehrer know this?
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I hope you get what I am trying to say.