Facebook showed me this article (paid/boosted): "Then, it started to cram your feed full of posts from accounts you didn't follow. At first, it was media companies, whom Facebook preferentially crammed down its users' throats so that they would click on articles and send traffic to newspapers, magazines, and blogs. Then, once those publications were dependent on Facebook for their traffic, it dialed down their traffic."
The ‘Enshittification’ of TikTok
Or how, exactly, platforms die.
wired.com