You're basically advocating government control of social media sites here. At least, that's my only reasonable interpretation for your statement regarding "giving social media sites the right to police free speech / expression". There is no way to accomplish this, unless an enforcement mechanism is put in place where the government tells social media sites exactly what they can and can't police.
Sorry, that is a far more uncomfortable situation, whether you know it or not. Perhaps you are hoping that mainstream social media sites can be forced to allow the type of content found in voat or 4chan. It is equally more likely that a government will, at some point, disallow the content found in voat or 4chan everywhere, if that angle is opened, IMHO. It, of course, will depend on who is in charge.
China, for instance, currently has heavy influence on exactly what kind of content is allowed within social media, complete with a Great Firewall and large armies of censors to enforce this policy. Their social media has been shaped many times based on the whims of Xi Jinping. China heavily moderates gaming and politics, and outright bans things like porn. I doubt a 4chan or voat in Jinping's China would get very far. In the Western Internet, there are big social media sites with various content moderation policies that some people may not like. But alternative sites exist.
At present, social media sites are relatively free to moderate how they wish. A few social media sites have semi-monopoly power, and that is a big issue. The payments processing duopoly is even more of a problem. But don't confuse monopoly power issues with "censorship". The government is not telling what the social media companies to do, in general.
Sorry, that is a far more uncomfortable situation, whether you know it or not. Perhaps you are hoping that mainstream social media sites can be forced to allow the type of content found in voat or 4chan. It is equally more likely that a government will, at some point, disallow the content found in voat or 4chan everywhere, if that angle is opened, IMHO. It, of course, will depend on who is in charge.
China, for instance, currently has heavy influence on exactly what kind of content is allowed within social media, complete with a Great Firewall and large armies of censors to enforce this policy. Their social media has been shaped many times based on the whims of Xi Jinping. China heavily moderates gaming and politics, and outright bans things like porn. I doubt a 4chan or voat in Jinping's China would get very far. In the Western Internet, there are big social media sites with various content moderation policies that some people may not like. But alternative sites exist.
At present, social media sites are relatively free to moderate how they wish. A few social media sites have semi-monopoly power, and that is a big issue. The payments processing duopoly is even more of a problem. But don't confuse monopoly power issues with "censorship". The government is not telling what the social media companies to do, in general.