He’s talking about private groups.
Regardless, no private platform is forced to provide you a voice. You can set up your own site and set up your own servers if need be. People have been getting their ideas out there before social media and even when the mainstream media wouldn’t cover them.
That’s how the civil rights movement came to prominence.
> Regardless, no private platform is forced to provide you a voice.
That was a reasonable stance historically. Only the government had real power to control speech.
Now a tiny number of platforms have a huge amount of power. They should have an obligation not to censor, because between them they can virtually block all practically available channels of communication.