It's certainly true that LinkedIn is the go to for white collar professionals seeking to make their resumes visible passively to recruiters. But isn't life still easier with LinkedIn than in the before times, when recruiters would dig deep to get folks' phone numbers and then have to call each of those people individually? (I think the modern equivalent would be email addresses.)
It's true that LinkedIn makes recruiting much easier to scale to a mass market. And it's also true that it has a monopoly on that scaling for professional employees. But is it fair to call them an economic termite when it's still possible to do sourcing in an admittedly clunky and old fashioned way? Just because they have a monopoly on scaled recruiting doesn't mean that they hold all the cards the way Linde (also in the profile) would in the gas market. This is particularly borne out by the existence of Indeed or Stack Overflow as options for posting your resume for recruiting.