The city says that the reason there is a test and license program is because ("security") they want to make sure that the tour guides are giving the right information; saving them from hearing the wrong information.

If this is the real reason, I think it would not be wrong, of course we fall into that it is a way to control everything, but at least tourists can count on greater security in choosing this type of service, without fear of being swindled, I doubt that demand will prosper, good information, happy night.