You&#x27;ll notice that the entire source code for reddit is hosted publicly here (<a href="https:&#x2F;&#x2F;github.com&#x2F;reddit&#x2F;reddit" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;reddit&#x2F;reddit</a>) which makes your question that much more interesting.<p>And the answer?<p>It&#x27;s the community and the centralization.<p>By making a subreddit, you have a chance at scoring some of the people who already visit the site, rather than having to look for them or advertise on your own. Discoverability aids the community, but it&#x27;s only made possible by centralization.<p>Then there are things like global shadowbans and antispam and the fact that karma is shared across reddit.com. If you made a separate reddit, karma on your site would not be reflected to the original. Which would suck.<p>Reddit.com dominated the reddit market for just about everything.