Why doesn Audacity ship with an MP3 encoder?
Unfortunately, the algorithm to encode or create MP3 files is patented, and Audacity would not be able to include an MP3 exporting algorithm without either charging a fee or violating the law in many countries. As a compromise, Audacity comes with the ability to use other MP3 encoders, which you must download separately. It is up to you to make sure you are in compliance with any licensing restrictions imposed by MP3 encoders. For more information, see the page on Exporting MP3 files.
