A (somewhat dated) example at [1] (german).
[1] https://www.lawblog.de/archives/2009/11/17/abmahnanwalte-ver...
Edit: When they send in that notice (die Abmahnung) they will ask for money for incurred costs. Since they did not pay anything in advance - the lawyer worked for free - there were no costs. That's not legal here.
What exactly was going on? Have they published images in misleading way?
Or is it case of going after people who published images with "source: Internet"? Or case of attacking people who made honest effort to attribute author?
Because I am familiar with big corporations using freely licensed work and ignoring attribution requirements. For example Facebook is displaying map using OpenStreetMap data. OpenStreetMap license requires a clear attribution, visible to all users ( https://www.openstreetmap.org/copyright ).
Facebook is ignoring that, Facebook employees claimed to be working on improvements, nothing was improved - attribution is still cleverly hidden.
The same with for example Snapchat.
But for all what I know they could be targeting marketing departments using stolen photos in ads.
As far as I understand, they don’t get that much more damages from larger cases, so they target masses of small fish instead. Individual ebay sellers, small private clubs (which are ingrained in the German culture) and the like.
But large business/enterprise screws up with image licensing too, and ends up just paying as well.