If I use TOR or JonDonym directly – where are the advantages?
At first you have to trust me, because I could log what you are doing. I’m not doing so, but you should know that this is possible. If you are using TOR or JonDonym directly, this is impossible. If you want to know why it is like it is, take a look at this article at Wikipedia. In the end, there is an operational agreement between JonDos and their mix-operators, which forces them to provide a high level of privacy.