Why Germany Educates International Students for Free

Certainly laudable. How does one "stick around" after graduation - do you have to learn German?

As a native German, I'd say it is essential in most parts of the country, except in a few urban areas such as Berlin or maybe Munich. But generally, for integration purposes (and also for better dealing with the infamous German bureaucracy), staying in Germany without learning German would become pretty painful after a while.

Depends on the area of work I guess. It's not that uncommon to have English as company language in startups or IT companies in general, but even if not you'll get around with English just fine.

Depends here you are. I have 20+ British / American friends in Berlin none of whom speak fluent German and get on just fine.

Funny. I took care of foreign students in my German university and they get exploited the hell out.

At first they pay more than German students for the same semester, despite having worse chances to succeed (language barrier, culture barrier, fewer friends/family etc). Then they have to join preparation courses one way or another, because, you know, German isn't easy. Then they hardly get access to the public student dorms and are put 3-6 people in old, unclean apartments far away from university (partly without public transport access) and EACH of them pays as much as a German would pay for the whole apartment. Professors also have huge power over them and in some points can even enforce them indirectly to return to their home country. Old dudes (teachers, profs, organizers) dating barely legal girls in exchange for favors also is accepted practice.

Sure, the official part of everything they have to do and pay to succeed may be the same as for Germans and none of the "fees" may be labeled as such, but studying in Germany is much more expensive for foreign students than for Germans.