Removal of malicious referrals/URLs is not censoring IMHO. Those shall be taken down/deleted, preferably from the blockchain to prevent harm to anybody. The blockchain is the central place of storage, and has many interfaces today and will get more in the future. When fighting the harm in the user interface, this will not cause potential harm through user interfaces that are not that quick to adapt itself, or may never embed features to warn the user for URLs that are malicious.