People used to post stuff to their own websites all the time. And when someone had a cool website and it blew up from getting shared on reddit and hitting the front page, the site would go down because 50,000 people were trying to access a webpage that could serve, at most, 1% of that volume at a time. This means you now have to contract with a CDN like Cloudflare if you expect to operate at scale (which you probably won’t). So people started posting to reddit or Facebook or whatever because there was a 0% chance of that happening. This article addresses those issues but also acknowledges that there aren’t any real solutions at the moment.