So Germany basically collected all its citizens that could be found (and that wanted to) around the world back home last month, including chartered airplanes and special permission organized for them to travel to the airport (~200.000 people).
Lots of countries had repatriation flights like that, but many thousands of people chose not to go, or couldn't make it work for various logistical reasons (they're travelling with a vehicle or a pet or who knows why)
Is that unusual?
https://de.wikipedia.org/wiki/COVID-19-R%C3%BCckholprogramm_...