There are many examples of patent trolls but this isn't one. MP3 was new, innovative, and the result of long effort. The patent fees directly funded new research of even better technology. That's the patent system working as designed.

I just read your blog post through Google Translate. You seem to claim that they patented the use of Fourier transform for storage of music. This is not what happened at all. The patent was granted for specifying which part of the Fourier transform can safely be discarded for storage (and reconstructed while playback) without harming the sound you hear too much. That's not something they just looked up in a 200-year-old book but took more than a decade of complex research. The result of this research is their actual product and it's a highly valuable one.