Goodhart's Law in action. Any "product quality" metric will be gamed to the point of uselessness as soon as it gains traction. In other words, services like this one can only work as long as nobody knows about them.
The only stable solution is for each person to curate and maintain their own set of sources, so that there are no high-value metrics for marketers to target. Exactly the opposite of what this service is trying to do.
[^1]: https://www.infoq.com/articles/wonders-of-postgres-logical-d...