This will end up biased by the largest employers. Kind of like crime maps--they make it seems like there's an extraordinary amount of crime concentrated in urban areas, but that is due (in part) because that's where a lot of people live. A small company might ghost 90% of applicants and have a low count of ghostings, whereas a large employer might ghost 2% of applicants and have a very large count of ghostings.
This website could be improved by recoding employers who did not ghost applicants.