Your parks have been taken from you and turned into outdoor business areas. what should happen is they should just let people use the parks for whatever they like so long as they are unobtrusive and not interfering with others who wish to use the public park.

there are other laws to deal with conflict between citizens, just apply those.

making a few bucks from your students and being penalized for that is not the point of what is happening when you really look at it.

teach for nothing in the park. problem solved.

make your bank in privates, on site or in your studio.

done.