OCHs were way more common in Germany than in other countries. Biggest boards like boerse and gulli used only OCHs. My guess is its because of those laws that torrenting was risky. But the truth is that for one pirate who used vpns, torrents and OCHs, there probably are a hundred people using streaming sites.
If you are interested in the German piracy history, there is a book anout the gulli board: gulliwars.com