As an admin, you can delete users tracked in Canny via the Users page:

You can also permanently ban a user from being able to ever post on your Canny Board again. We only recommend using this option if there have been clear abuse/spam concerns. Marking a post/comment as spam will also delete and ban the author.

Use the checkboxes to delete multiple users at once:

Users can also be deleted automatically via the Canny API, though this is not recommended for the reasons listed below. Remember that a user's feedback can still have enormous value, even if that user has churned or is otherwise inactive.

Once you delete a user, they will also be removed as a tracked user. The changes will be reflected in your billing. Learn more