It's 110% US values -- free speech for all who can pay.
Coupled with a vestigial strain of anything-goes-on-the-internet. (But not things that draw too much political flak)
The bubbles aren't the problem; it's engagement as a KPI + everyone being neurotic. Turns out, we all believe in at least one conspiracy, and presenting more content related to that is a reliable way (the most?) to drive engagement.
You can't have democratic news if most people are dumb or insane.