That logic relies on the fact any single private corporation controls at most a small part of public discourse, so no single platform can impose speech codes on all of society. But modern tech monopolies benefit from network effects and actively collude with and lobby government to crush would-be competitors. So the old rules no longer apply to them
- Mandate interoperability to break network effects
- Possibly (more extreme measure, not certain about this one) "common carrier" laws that treat the biggest platforms like public utilities (can't moderate at all). This might make Facebook & co. unviable in their current guises, but would that really be such a bad thing?
