Napster may not be the best analogy for you.

Napster broke down record companies' monopolies on music, and pushed them to finally implement streaming, but also make music worldwide basically free.

Even if its creator lost the lawsuit, and Napster was no more, it pushed musicians and studios to do something that they were reluctant otherwise.

So it was a success by making music free, even if as a product it turned out to be a failed one.