The loudest ones are not aligned with eachother. Their efforts to influence public opinion will neutralize eachother, and none of them can gain moderating power over the platform because the platform is just protocols. Ideas will clash, leaving only what people think is good in common. And that is the definition of the common good.
Do you have any better ideas? Or do you think that you possess the superior definition of "good" such that public discourse to search for it is unnecessary?