My personal view is that the bot provides a net negative, and should be removed.
Firstly, I would argue that there are few, if any, users whom the bot has helped avoid misinformation or a skewed perspective. If you know what bias is and how it influences an article then you don’t need the bot to tell you. If you don’t know or care what bias is then it won’t help you.
Secondly, the existence of the bot implies that sources can be reduced to true or false or left or right. Lemmy users tend to deal in absolutes of right or wrong. The world exists in the nuance, in the conflict between differing perspectives. The only way to mitigate misinformation is for people to develop their own skeptical curiosity, and I think the bot is more of a hindrance than a help in this regard.
Thirdly, if it’s only misleading 1% of the time then it’s doing harm. IDK how sources can be rated when they often vary between articles. It’s so reductive that it’s misleading.
As regards an open database of bias, it doesn’t solve any of the issues listed above.
In summary, we should be trying to promote a healthy sceptical curiosity among users, not trying to tell them how to think.