This article reminds us of what I have been saying for years, that the supposedly free college education that exists in Germany is not what leftists think it is. This is because in Germany people get tracked very early (age 12) onto a college or vocational track. It’s not as though everyone is going to get to go. And while the article doesn’t say who gets tracked onto the vocational track as opposed to the college track, it’s likely that this tracking is class-based, so “free” college becomes welfare for the rich.
The article also links to another article (here) that suggests something else I have been saying for years, that while college in general is a good value, that doesn’t mean that it is a good value for everyone. The article suggests that those in the 25th percentile don't do very well, but I suspect that those who come from the lower class aren’t likely to do very well either, even if they get good grades. Further studies are needed.