I've not been censored on HubPages but I do know of two Hubs that were taken down.
One was about a gun, an AR-15, I believe. I got started reading it and had to come back to it later only to find it had been removed. It appeared as though HubPages staff had removed it.
The other was about Islam. An atheist flagged the article to HubPages staff and it was removed. I have noticed they have no problem leaving the ones that bash Christianity but, then again, Christians aren't as overly sensitive as Muslims and atheists.