It seems that they censor submissions from some low-quality sites (I suspect this is part of the reasoning) content from which is likely to lead to flamewar-typ

It seems that they censor submissions from some low-quality sites (I suspect this is part of the reasoning) content from which is likely to lead to flamewar-type discussions. This not subject matter censorship, but it is a good form of censorship that helps keep this site high-quality. These practices are part of the reason discussion on this site is so much better than the norm on the internet, and should be a reason for you to want to stay.