Did you choose to follow those people at some point? I get regular "recommendations" on who to follow on LinkedIn, including Gates, Nadella, and Branson, but I never take them. And I don't have any content in my feed from any of those folks.

All the content in my feed is from my connections or interactions by my connections. Of course there is plenty of vapid "thought-leader" content from them too.

Actually I've gotten some amusement from watching a few former colleagues overtly try the "LinkedIn thought leader" thing. Kind of funny to observe the (sometimes very large) gap between what they post and what I know they used to do in their day jobs.