Here are two examples to illustrate this:
Example 1: We create a project to monitor our band mentions
We list our client’s website, medium page, exernal landing pages etc to capture mentions of our websites and links to our websites, but we don’t want to actually see our website pages being picked up as mentions.
Example 2: We create a project to monitor our competitors mentions
We list all our competitor’s websites and landing pages in order to capture all external mentions of our competitor’s websites on the web, but don’t actually want to their websites appear in the mentions clogging up the reports.
In both cases, a 1 click exclude domains from appearing as mentions would be practical instead of having to type each domain name again to exclude these, or to have to mark them as spam.
It’s a small UI change but from a new user’s perspective seems like a no brainer.