How does not paying for works not hurt sharing? If return on investment on works is being hurt then that's a demotivator for future works. Monument Valley had something like a 95% pirating rate on Android. That affects the expectations of indie devs and investors. Brushing this under the carpet doesn't change the facts.
If pirating was more under control, we'd see more innovation and top notch applications in the Android market. Instead, we see all the top notch applications go to iOS either exclusively or only to Android after they've made money on iOS and then publishers decide to push out a port because its just going to get pirated anyway. The difference between these two ecosystems is proof enough that pirating games hurts innovation, companies, and customers.
You certainly can ask people if they want to share their own work. You can't take it for granted that people have a moral obligation to share the products of their labor. People might say if you don't agree with the license "then stop using GPL code", similar to how someone might say "then stop using copyrighted music/movies/games". It seems to me, that these statements are equivalent, but the attitudes of people are not the same.