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LinkedIn is the perfect example of techbros' "invisible vampire" business methods.
The site will heckle you, the user, until you indicate your field of employment, then you'll be spammed with job offers - a few of them even vaguely relevant.
Whether you're interested in finding a different job or not.
Like for any spammers, they don't need many takers for it to be cost-effective.
It's these companies in recruitment advertising - not the job providers or jobseekers - that fill LinkedIn's coffers.