It is exploiting the system without paying for it, but there's plenty of that going in the other direction as well - educated eastern/southern europeans in thei

It is exploiting the system without paying for it, but there's plenty of that going in the other direction as well - educated eastern/southern europeans in their 20s coming to Germany to work with their childhood and education already paid off, pay Germany taxes for a few years/decades and then go back to their home countries. Germany in particular gets a lot more economic immigrants than emigrants so it probably adds up as positive or neutral.