The problem is on the demand side, not solely on the supply side. People desire reinforcement not challenge. That is natural. I suspect it is true of us all. Those who are capable direct their potential to be challenged in specific ways, allowing themselves to have biases reinforced in the unimportant places. And they have access to the knowledge in their specific areas.

This is the reason for the enduring power of the filter bubble: it is a stable equilibrium because it serves both the purposes of the demand and supply side.

You can test this by making high-reliability websites that state honest priors. You'll get an audience but the audience will be pretty specific to your subject matter and not be popular. No information source has had all of the following characteristics:

* Broad-based popular support

* High information content

* Novel information, i.e. information you can't get elsewhere

* Sustained presence

This may actually be desirable. Novel reliable information is an advantage, but it may not be a present sufficient advantage, and species survival may depend on presently boosting those capable of acquiring and utilizing information advantage. i.e. a time may come when we need to be good at it - if we have more people with this characteristic then, it'll lead to better outcomes.