The thing about zines that is most interesting is that it is free from the constraints of form and content. It can literally be made from a collage of different ideas, viewpoints, and influences. Or it can follow one specific topic (see example). But most of the time, they just follow a central theme per issue, and the content just goes in wildly different directions from there.
It gives all the team members equal space to do whatever they want. This is the very essence of creative freedom. Zines embody this in the purest possible form.