You are conflating the two meanings of free. Pirated software does not improve your freedom and open source is not necessarily free.
That being said I've seen a few indie game studios making pro-piracy statements or even putting the game on torrent networks themselves. But these are the one that deserve the most to be paid.
I can't, I forgot most of it. But a little search returned some results:
But it's also true that sometimes it's not done with a pro-piracy stance but they would just rather have it pirated than bought through key-resellers as these can hurt indy-game dev a lot.