This is an encouraging example, not just because they did the right thing, but because they struck a workable balance between pragmatism and good citizenship. From the post, it seems Bitmovin' didn't actually need to fight anything in court. They just did enough legwork to credibly threaten legal action against the troll, who then backed down.

This is a relatively low-cost tactic that others might well employ too. If it catches on, the bar will be raised for trolls, and the business model will become less profitable.