I don't think downvoting is the complete solution, but rather communities and user interfaces.

But I also don't see a lot of copyright violations as anything bad at all. What "Zer0hedge" does for example is totally fine imo and he even goes out of his way to show that he's not actually Zerohedge in both name and posts.

The type of content that he provides actually helps this platform quite a bit, because it lets users consume news without leaving the site. That increases both engagement and retention rates.

In the future it's also not impossible that this will peak the interest of Zerohedge or others and that they will start crosspublishing to establish their name here. By that time, the user interfaces and community functions could help us sort the content we want to see more efficiently and even mark confirmed authentic accounts.

So the bottom line, I don't think most copyright violations are neither immoral nor that they harm the platform. Rather I think that overall they will only help, as long as we have the option of hiding the really poor quality posts (including pure copy paste, impersonations and sensitive material such as porn etc) of course.