Most of those accounts are actual people registered with their actual name using spamming tools (some of them LinkedIn approved) to connect with as many people as possible though, usually to boost the appearance of their personal profile and have as wide a possible audience for promotional messages they share rather than to circumvent LinkedIn's information paywalls. Spamming people loosely connected with your industry with what you're doing at work is, after all, LinkedIn's intended purpose...
Oh no doubt, but I would put that in the same categorization as "fake accounts" in the sense that the intended purpose is general malfeasance. I.e. connecting not just to boost their own profile potentially but also to try and harvest any personal information you have published on the site.
