Could it be that it's because the calls would need to come from outside the country(probably outside the EU) and there is disproportionately more English speaki

Could it be that it's because the calls would need to come from outside the country(probably outside the EU) and there is disproportionately more English speaking people outside Germany? It's a problem similar to why there are more viruses for Windows, well, it's why there's more Windows machines in the world.