Yes. People add themselves for self promotion which is at worst useless bandwidth but sometimes in cases of fraud/deception. I have seen cranks add pages about

Yes. People add themselves for self promotion which is at worst useless bandwidth but sometimes in cases of fraud/deception. I have seen cranks add pages about themselves as if they are experts on a subject which they are definitely not. That is harmful because you can mislead people since part of the appeal is the effect this has on google search results and the authoritative appearance of Wikipedia can mislead people.