To answer your question in relation to Summit, or any Lemmy client in general:

Implementing a feature like this interferes with user agency. I dislike the idea that my device would be sending my reading habits to a fact checking site. Since the implementation would most likely be domain agnostic, that website wouldn’t just know my political stance, it would also know my interests. I don’t need any more targeted advertising for Legos, sports paraphernalia, or enterprise server equipment.

From a developer perspective, I bet that API costs money eventually. It’s a trap.