A good option, now that GOG do it though Steam don't yet, is that GOG will do an unconditional refund within 30 days. So one could buy it there, test it and if things don\t work out as you'd like then you can get a refund rather than running the risk that you get caught downloading a torrent or get a torrent infected with a virus.
GOG will never give unconditional refunds. Any fool could just buy a game from GOG, download it, tell GOG they don't like the game and ask for a refund. Meanwhile the game is already downloaded, so GOG can't tell if you're still playing the game or not. No company in the world would do business like that.
