Those seem like some decent mitigations, but I still have a hard time believing that wealthy corporations and people won't be able to abuse such a system for th

Those seem like some decent mitigations, but I still have a hard time believing that wealthy corporations and people won't be able to abuse such a system for their own gain as they have done with the DMCA. And how those well meaning restrictions could easily throttle a competitive startup, because Facebook et al have the scale, technical and legal experience to handle these things whereas they may not