Ask HN: Why are all content apps so insanely cluttered?

Open any social media app, or news app, or any other app, it's like they want to throw three million choices at you. Ad, hit like, subscribe, vid in vid, etc.

The best blogs however only show you maybe 1-5 articles with great design, and it actually causes me to read more.

So from the UI/UX perspective, why do companies continue to make reading harder? Is there some psychology behind it?