Cusdis is not designed to be a complete alternative to Disqus. It's aim is to implement a minimalist and embeddable comment system for small websites (such as your static blog).
Given below are the pros and cons of Cusdis:
Pros
Cusdis is open-source and self-hostable. Hence, you own your data.
The SDK is lightweight(~5kb gzipped).
Cusdis doesn't require your user to sign in to make a comment.
Cusdis doesn't use cookies at all.
Cons
Cusdis is on the early stages of its development.
There is no spam filter, hence, you will have to manually moderate your comment section and comments won't be displayed until you approve them.