Disqus is a proprietary commenting system implemented on a great many sites (including free software project sites). Using this system is breach of privacy by design, Disqus as a third-party widget collects too much user data on all sites that use it, just like Facebook widgets. Also, Disqus had many security flaws, you can read more about them here: https://en.wikipedia.org/wiki/Disqus#Criticism,_privacy,_and_security_concerns
In the toot below I have listed privacy friendly, free (as in freedom) alternatives to Disqus.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.