I have come across the necessity of this option lately and feel like people can use this for improvising the UX of the filtering process.
Example: Let's say I'm searching for a UX Internship and would love to look for opportunities in Europe.
Now, I am not so enthusiastic to work in certain European Countries though. I had a few listings from such companies. The work was of my interest but the place was not(Various reasons). I didn’t want to see such listings anymore.
Set A- Include Query
Set B- Exclude Query
The user is shown results from Set A-Set B.
This problem is omnipotent!
Is this good?
*all countries are equally lovely, just for representation.