They are parasites because they actively make it hard for people to find jobs adverts directly, by flooding job sites with their own adverts.
In the age of Google it should be relatively easy to search for job ads in a particualr area. But it isn't. Because 99.9% of the search results will be recruitment agencies.
When I search job sites for jobs within 5 miles of my home town, most of the results are actually for jobs in London, which is 30 miles away, because recruiters post ads for those jobs with the "misleading" location knowing that some people from my town will be willing to commute.
In the age of Google it should be relatively easy to search for job ads in a particualr area. But it isn't. Because 99.9% of the search results will be recruitment agencies.
When I search job sites for jobs within 5 miles of my home town, most of the results are actually for jobs in London, which is 30 miles away, because recruiters post ads for those jobs with the "misleading" location knowing that some people from my town will be willing to commute.