Perhaps in certain subreddits that's true, but on Reddit, it's easy to find both far right and far left echo chambers. And it's easy to find centrist communities. It's also easy to find communities where people don't talk about politics at all, and just discuss their favorite TV show or 3D printing filament without bringing anything else up.
That's not the case on these other "free-speech" reddit clones - they're exclusivly far-right extremist content.
That's not the case on these other "free-speech" reddit clones - they're exclusivly far-right extremist content.