I read zines before we had an internet (*feels old*), and at the time, there was a *very* strong code of honor -- and common sense because although zines flew under the copyright radar rather more than online fic, people were fully aware of those issues -- that zines were purely nonprofit. It is true that some people are exceptions to the rule, but the odd exception does not change the fact that most people in the zine world did/do follow that code of honor.