While Reddit is clearly a bad actor that censors non-Leftist (and other) content, /r/European had a problem: getting outside of the /r/Europe mental ghetto invited in all the Stormfront types, who promptly had a field day writing what they usually do, in addition to posting memes. Because of its "free speech" roots, /r/European refused to censor them, which essentially killed much discussion because the angry hive of a different sort would quickly arrive. Most of these Stormfronters, ironically, appeared to be simply Leftists who dislike Jews and immigration. In other words: typical Reddit content, with a twist of angry racial resentment.
The moderators of /r/European have taken their activity to Voat, where they have freedom but a much smaller audience. The retreat from social media is not a victory; it allows Reddit to continue to present its "safe space" as a free discussion forum. However, it also makes clear that free speech is not actually wanted on Reddit, so perhaps this pyrrhic self-immolation will bring good yet.