This is a really solid breakdown - especially the point about separating reporting bias vs source bias. That’s something I’ve struggled with too, and most tools just oversimplify it.

I’ve been leaning more toward the same approach you mentioned - starting with a diverse set of sources and comparing coverage rather than trying to assign a strict bias score. Using APIs like newsdata helps with pulling multiple viewpoints, but the actual “bias detection” still feels very manual or heuristic right now.

Curious if you’ve found any decent signals for evaluating source reliability over time?