This argument applies to all speech that has now become easier and cheaper: "If nobody cared about your opinion, it would not be financially viable to publish

This argument applies to all speech that has now become easier and cheaper: "If nobody cared about your opinion, it would not be financially viable to publish it. But now we have blogs/tweets." Effectively, cost of publishing was working as a quality filter. Now, we need to actually implement proper filters instead of bad proxies for quality.