When the real product is eyeballs on ads
You start to optimize for that.
You get users to keep reloading. You get users to stick around. Because the more pages they load, the more money you make.
It doesn't matter why people keep reloading. Doesn't matter if they're being shown things they really need. Doesn't matter if they're being shown truth or lies. Doesn't matter if they're reloading a lot because they're in the middle of a flame war. Doesn't matter if they're left happier or stressed out by using your product.
It just matters that they saw a lot of ads.
This is why the much-loathed algorithmic timelines happen: here's something a lot of your circles spent time engaging with, maybe you'll like it too! Stick around. See more ads.