But I just deleted it. When the form asked why I was leaving, I said:

I am leaving Google+ in protest to the way it is increasingly encroaching on other aspects of my internet use. I do not want my Google account to have anything to do with my YouTube activity or any other site. I do not want to be paranoid that you will suddenly start auto-sharing every video I watch on YouTube with my entire family. I do not like that I am being forced into something I never agreed to. And I am content to stop commenting on YouTube altogether. Sorry, Google, but this relationship has become too manipulative and controlling for me.