You could probably create your own smart contract (not under the .ETH registrar) that had absolutely zero censorship, but it would probably end up being overrun

You could probably create your own smart contract (not under the .ETH registrar) that had absolutely zero censorship, but it would probably end up being overrun by scumbags and unusable across the wider network as everybody else builds filters around them... I've just been reminded that the takeaway at the conference was that the second level filtering was intended as a voluntary layer implemented via filtering. I had my doubts around that, but there you go.