It is rare I think because of the parent company's CEO and founders don't like to really lose control to someone else. A child company is not easily managed (a

It is rare I think because of the parent company's CEO and founders don't like to really lose control to someone else. A child company is not easily managed (and they shouldn't, but that's scary and risky by itself. The parent company need to have the know-how of an a serial startup builder investor)