Guy should be charged with extortion and punished by transferring all of his current and future works into public domain as soon as they are published.
IANAL, but I believe there maybe a "fair use" defense to convey information. I hope this lawsuit is thrown out of German court(s) with the equivalent of "prejudice" so they cannot file additional frivolous lawsuits.
"Böhme previously won a similar copyright case regarding an image with his photo-based wallpaper at Cologne Regional Court last year. This lawsuit was also against a landlady of a vacation apartment."
I hope one of these assumptions is untrue: the photographer views their portfolio as the artistic-equivalent of Ansel Adams despite "licensing" it as home wallpaper, doesn't care about PR, has nothing else better to do, no customers, and a surplus of cash.
The only solution is to find the mason who built the wall that the photographer is blatantly taking credit for, and convince that artist to sue the photographer for failing to attribute credit.
> Böhme alleges that while he may have authorized the printing of his photo on the wallpaper, he did not authorize the “reproduction” of the photo on the wall in the image posted by the landlady on the vacation property rental website.