Some people might even call it a "patent troll"
Oh, how naughty!
The problem with patent trolls is, that in the long term they damage the patent system and make it more difficult for inventors to be compensated for their inventions. Certainly the American patent system also has it's problems, but here we have a valid patent that was bought by a troll-like entity that starts shooting around at cat & dog in the hope to monetize. I suppose they aim for out of court settlements, as their claim doesn't sound like it would hold up in court. Anyway - even this example shows that the system is not completely broken. The inventors could sell their patent and got paid. The problem in this case seems rather to be the American court system. A rather big problem, of course.