So... in other words should a company become so successful that they earn the level of ability to shape views, you want them moderated? What would be the incentive of any company becoming so successful that you'd want to take them over and turn them into public utility because they did what they set out to do? Doesn't seem like the business friendly pro business right to me. Seems like something else...
I believe back when there was another silly conversation about diversity in literature & movies, the claim by those on the right is that PoC should make their own successful characters. Publishers & studios should not change older established characters that the right loved, that was going to far. Why isn't that same philosophy applied when it comes to those on the right who don't feel they are getting their way? As others have suggested, just leave those liberal overrun platforms and establish your own.
I.E. start your own private company where you decide what is acceptable on your platform.