That's sort of untrue; the history of radio and television in the US has a significant amount of moderation that did not run afoul of the first amendment. See for the current day: https://www.fcc.gov/consumers/guides/fcc-and-speech
Aside from that, you're highlighting a US-specific dynamic. Other nations have different legal standards on speech; e.g. Britain has quite harsh libel laws. My assumption is that certainly some nations (not all) would be in a decent position to offer a well-moderated platform that is in line with their legal standards.
Aside from that, you're highlighting a US-specific dynamic. Other nations have different legal standards on speech; e.g. Britain has quite harsh libel laws. My assumption is that certainly some nations (not all) would be in a decent position to offer a well-moderated platform that is in line with their legal standards.