It appears to be the drivers who will be fined.
"Violations will result in a fine against Uber of 250,000 euros ($328,108) per ride."
So at least according to that story, Uber will be fined, not the drivers.
Not an expert on German law so forgive me if I'm way off base.
Yes, if you dismiss the fact that Uber is a millions-of-dollars business and the individuals targeted by the much-derided MPAA/RIAA lawsuits were not.