Spurious claims that damage someone else's reputation are libel or slander, and are rightly actionable.
I've long thought that doing to this what copyright trolls did to copyright infringement is a road to profit for social media companies. Help connect the outspoken with the damaged and take a cut.
You're ignoring the problem I mentioned above. That's not a solution, just pretending the system you envision is viable. Let's look at the problem and make it viable.
I'd consider it an improvement over the current situation, where discourse is drowned in a sea of sanctionable incivility. Technology that has made spreading the shit easier needs to be matched by technology to control the shit.
I've long thought that doing to this what copyright trolls did to copyright infringement is a road to profit for social media companies. Help connect the outspoken with the damaged and take a cut.