Okay, so where does the server run? Because the only reason I'm using Disqus is because I don't have "a server" that backs my website, it's just static hosting.

Okay, so where does the server run? Because the only reason I'm using Disqus is because I don't have "a server" that backs my website, it's just static hosting. If I need to set up my own server just to get comments, that's not a "drop in replacement", that's a costly (especially the hours spent on maintenance) replacement.