As the blog owner you opt into ads on your blog in disqus. If you don't want the ads go check the settings in the disqus control panel and all 3rd party requests disappear.
checking my own blogs using disqus I see no 3rd party requests at all with my ad blocks off
Tracking is turned on by default, but it's pretty simple to turn it off as the site owner. It's clearly marked in the administration section. As you said, with ad tracking turned off there are no such requests.
As the blog owner you opt into ads on your blog in disqus. If you don't want the ads go check the settings in the disqus control panel and all 3rd party requests disappear.
checking my own blogs using disqus I see no 3rd party requests at all with my ad blocks off