Rewriting History: Who controls the truth in the age of AI?

Elon Musk says he wants to retrain his AI, Grok, to “rewrite the entire corpus of human knowledge.” But who gets to decide what counts as truth? 

By deleting what he sees as “garbage,” there’s a big ethical risk of simply replacing one bias with another. 

So, is it ethical for one person or company to decide what stays, what goes, and what counts as fact?