Unauthorized distributors hurt the copyright holder's freedom, because he is
no longer free to determine how something that actually belongs to him, will
be distributed.
Truth is, and i have said it here before: people behind those sites don't
care about "sharing" or "making a better world". They care about "watching
the latest hollywood trash" and "getting money from ads". They do nothing but
harm to our society and also to the free/open culture.
Want to share? Respect the license and share what is public domain and
creative commons. Maybe you will encourage people to CC license their content
in the future, thus making a better, freer world.
Piracy? Is bad, wrong and totally unnecessary. I have a ccomputer, I listen
to music, I watch movies, I read books... And I don't do piracy. I don't live
like a caveman to reject piracy, I actually live in a way that sometimes
leads me to greater knowledge. Is piracy necessary? nope. Is it good? nope.
Is it morally right? Nope.
Got it?
