It's ok to copy for others, but you don't need to help them copy. After all, college is very free. Basically, everyone takes care of themselves. As long as the teacher doesn't care, no one will care after the final exam. Anyway, I've seen many people who haven't done their homework once a semester. Besides, those teachers don't necessarily read it, they just let the teaching assistants read it, and most of them just write a date to perfunctory. So don't worry too much, the university depends on itself.