The censorship claims are pure nonsense being blown out of proportion. r/bitcoin engages in standard moderation, not different from what I would expect to see in any other subreddit. Their job is more difficult than normal, though, due to all the voting robots and narrative manipulation that the bitcoin community has been suffering from in recent years [0].
[0] https://medium.com/@shesek/observing-forced-narratives-and-m...