Most people are biased about themselves. In particular famous people often want to hide controversy.

Yeah, but things I wonder: Do people learn surprising things about themselves from their own Wikipedia page, like a connection to some event or other person that they previously weren't aware of? Do they find their pages laughably incomplete or inaccurate?

If there were a Wikipedia page about me, I can imagine that it would probably highlight some insignificant thing (from my perspective) that got my name into a small town newspaper or school / employer public relations piece while omitting several of the facts from my personal top-5 list (in importance) about my own life.

I suppose if I ever get my own Wikipedia page the first thing I should do is publish an autobiography.