Oh that's interesting. I just assumed. Sorry! So who collects the tax?
If you have any questions, feel free to ask. Perhaps I need to make improvements to the text. Sometimes you've been around for so long that you forget what confuses people.
The money is not a tax because it's not the government that collects it, and the government cannot decide how much it should be. Instead, there are institutions that have been granted powers to levy their own fees and self-govern to a large degree. Accountability is established through an oversight board that includes representatives from civic society and other independent review institutions.