These changes collectively did just as much(in fact, I think more) as twitter and facebook to silo-ize the web.
This concept that companies should be expected to act in the best interest of their users/consumers/employees is why some people have the misconception that all regulation is bad, and leaders are applauded for blindly repealing them.
Personally, I don't expect anything more of a corporate enterprise than that of which they are legally obliged.
Thiel is definitely a business leader, but is he really an ideological leader? If I recall correctly he was decidedly in the minority when he came out for in support of Donald Trump.
(Although, probably the professor who wrote the article didn't write the headline.)
Private companies want what their users express as want through usage or purchases. Users don't always do or buy what's best for them. If they did, nobody would ever eat fast food.
It's frustrating that our intelligentsia parrots this misinformation.